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		<h1>Giải Sách bài tập Toán 6 ôn tập chương 2&#x3A; Số nguyên</h1>
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			Hướng dẫn giải chi tiết: Sách bài tập Toán 6 Ôn tập chương 2: Số nguyên
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			<div style="text-align: justify;"><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>159. Trên trục số cho hai điểm c, d (hình dưới).</b></span></span></span><br  />
<img alt="cau 159" height="41" src="https://sachgiai.com/uploads/news/2019_10/sbt-toan-6-chuong-2-bai-9-cau-159.jpg" width="400" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. Xác định các điểm -c, -d trên trục số</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. Xác định các điểm |c|, |d|, |-c|, |-d| trên trục số</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. So sánh các số c, d, -c, -d, |c|, |d|, |-c|, |-d| với 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a, b. Các điểm -c, -d, |c|, |d|, |-c|, |-d| được biểu diễn trên trục số</span></span></span><br  />
<img alt="sbt toan 6 chuong 2 bai 9 cau 159 da" height="100" src="https://sachgiai.com/uploads/news/2019_10/sbt-toan-6-chuong-2-bai-9-cau-159-da.jpg" width="400" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. Vì c &gt; 0 nên -c &lt; 0, |c| &gt; 0, |-c| &gt; 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Vì d &lt; 0 nên -d &gt; 0, |d| &gt; 0, |-d| &gt; 0</span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>160. Cho số nguyên b. So sánh b với -b, -b với 0.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Nếu b &gt; 0 thì b &gt; -b và -b &lt; 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Nếu b = 0 thì b = -b = 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Nếu b &lt; 0 thì b &lt; -b và -b &gt; 0.</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>161. Sắp xếp các số sau theo thứ tự tăng dần:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">-33, 28, 4, -4, -15, 18, 0, 2, -2</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">-33, -15, -4, -2, 0, 2, 4, 18, 28</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>162. Tính các tổng sau:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. &#91;(-8) + (-7)&#93; + (-10)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 555 - (-333) - 100 - 80</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. -(-229) + (-219) - 401 + 12</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. 300 - (-200) - (-120) + 18</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải: </u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. &#91;(-8) + (-7)&#93; + (-10) = (-15) + (-10) = -25</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 555 - (-333) - 100 - 80 = (555 + 333) - (100 + 80)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 888 - 180 = 708</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. -(-229) + (-219) - 401 + 12 = (229 - 219) - (401 - 12)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 10 - 389 = -379</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. 300 - (-200) - (-120) + 18 = (300 + 200) + (120 + 18)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 500 + 138 + 638 </span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>163. Liệt kê và tính tổng tất cả các số nguyên x thỏa mãn:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. -4 &lt; x &lt; 5</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. -7 &lt; x &lt; 5</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. -19 &lt; x &lt; 20</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải: </u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. -4 &lt; x &lt; 5 =&gt; x <span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">∈</span> {-3; -2; -1; 0; 1; 2; 3; 4}</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có: (-3) + (-2) + (-1) + 0 + 1 + 2 + 3 + 4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= &#91;(-3) + 3&#93; + &#91;(-2) + 2&#93; + &#91;(-1) + 1&#93; + 0 + 4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= 0 + 0 + 0 + 0 + 4 = 4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. -7 &lt; x &lt; 5 =&gt; x <span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">∈</span> {-6; -5; -4; -3; -2; -1; 0; 1; 2; 3; 4}</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có: (-6) + (-5) + (-4) + (-3) + (-2) + (-1) + 0 + 1+ 2 + 3 + 4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= &#91;(-6) + (-5)&#93; + &#91;(-4) + 4&#93; + &#91;(-3) + 3&#93; + &#91;(-2) + 2&#93; + &#91;(-1) + 1&#93; + 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= (-11) + 0 + 0 + 0 + 0 + 0 = -11</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. -19 &lt; x &lt; 20 =&gt; x <span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">∈</span> {-18; -17; -16; ...; 17; 18; 19}</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có: (-18) + (-17) + (-16) + ... + 0 + ... + 17 + 18 + 19</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= &#91;(-18) + 18&#93; + &#91;(-17) + 17&#93; + ... + &#91;(-1) + 1&#93; + 0 + 19</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= 0 + 19 = 19</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>164. Tìm số nguyên a, biết:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. |a| =4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. |a| = 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. |a| = -3</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. |a| = |-8|</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">e. -13.|a| =-26</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. |a| = 4 =&gt; a = 4 hoặc a = -4</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. |a| = 0 =&gt; a = 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. |a| = -3. Không có giá trị nào của a vì |a| ≥ 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. |a| = |-8| = 8 =&gt; a = 8 hoặc a = -8</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">e. -13. |a| = -26 =&gt; |a| = 2 =&gt; a = 2 hoặc a = -2</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>165. Tính:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. (-3).(-4).(-5) = -(3.4.5) = -60</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. (-5 + 8).(-7) = 3.(-7) = -21</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. (-6 - 3).(-6 + 3) = (-9).(-3) = 27</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. (-4 - 14) : (-3) = (-18) : (-3) = 6</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>166. Tính:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. (-8)<sup>2</sup>.3<sup>3</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 92.(-5)<sup>4</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. (-8)<sup>2</sup>.3<sup>3</sup> = 64.27 = 1728</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 9<sup>2</sup>.(-5)<sup>4</sup> = 81.625 = 50625</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>167. Tìm số nguyên x, biết:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. 2.x - 18 = 10</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 3.x + 26 = 5</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. |x - 2| = 0</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. 2.x - 18 = 10 =&gt; 2.x = 10 + 18 =&gt; 2.x = 28</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; x = 28 : 2 =&gt; x = 14</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 3.x + 26 = 5 =&gt; 3.x = 5 - 26 =&gt; 3.x = -21</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; x = -21 : 3 =&gt; x = -7</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. |x-2| = 0 =&gt; x - 2 = 0 =&gt; x = 2</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>168. Tính (một cách hợp lí):</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. 18.17 - 3.6.7</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 54 - 6.(17 + 9)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. 33.(17 - 5)- 17.(33 - 5)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. 18.17 - 3.6.7 = 18.17 - 18.7 = 18.(17 - 7) = 18.10 = 180</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. 54 - 6.(17 + 9) = 54 - 102 - 54 = (54 - 54) - 102 = -102</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. 33.(17 - 5) - 17.(33 - 5) = 33.17 - 33.5 - 17.33 + 17.5</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">= (33.17 - 33.17) - 5(33 - 17) = 0 - 5.16 = -80</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>169. Cho hai tập hợp: A = {2; -3; 5}, B = {-3; 6; -9; 12}.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>a. Có bao nhiêu tích a.b (với a </b><b><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">∈</span> A và b </b><b><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">∈</span> B) được tạo thành?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>b. Có bao nhiêu tích lớn hơn 0, bao nhiêu tích nhỏ hơn 0?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>c. Có bao nhiêu tích là bội của 9?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>d. Có bao nhiêu tích là ước của 12?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Các giá trị của a, b và a.b được thể hiện trong bảng sau:</span></span></span><br  />
<img alt="sbt toan 6 chuong 2 bai 9 cau 169" height="144" src="https://sachgiai.com/uploads/news/2019_10/sbt-toan-6-chuong-2-bai-9-cau-169.jpg" width="400" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. Có 12 tích a.b được tạo thành.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b. Có 6 tích lớn hơn 0 và 6 tích nhỏ hơn 0.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c. Có 6 tích là bội của 9.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d. Có 2 tích là ước của 12. </span></span></span></div>
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