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		<h1>Giải Sách bài tập Toán 6 chương 1 bài 16&#x3A; Ước chung và bội chung</h1>
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			Hướng dẫn giải chi tiết: Sách bài tập Toán 6 chương 1 bài 16: Ước chung và bội chung
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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>169. a. Số 8 có là ước chung của 24 và 30 không? Vì sao?</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. Số 240 có là bội chung của 30 và 40 không? Vì sao?</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">a. Ta có: 24 ⁞ 8; 30 </span></span></span><img alt="" height="18" src="https://sachgiai.com/uploads/news/2019_10/image_52.png" width="8" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;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">Vậy 8 không phải là ước chung của 24 và 30.</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. Ta có: 240 ⁞ 30; 240 ⁞ 40</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Vậy 240 là bội chung của 30 và 40.</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>170. Viết các tập hợp:</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. Ư(8), Ư( 12), ƯC(8; 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">b. B(8), B(12), BC(8; 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"><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. Ư(8)= {1; 2; 4; 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">Ư(12) = {1; 2; 3; 4; 6; 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">ƯC(8; 12) = {1; 2; 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. B(8) = {0; 8; 16; 24; 32; 48;...}</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( 12) = {0; 12; 24; 36; 48; ...}</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">BC(8; 12) = (0; 24; 48; ...}</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>171. Có 30 nam, 36 nữ. Người ta muốn chia đều số nam, số nữ vào các nhóm. Trong các cách chia sau, cách nào thực hiện được? Điền vào chỗ trống trong trường hợp chia được.</b></span></span></span></div>

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			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 43px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nhóm</b></span></span></span></span></td>
			<td style="border-bottom: none; width: 103px; padding: 0cm 0.7px; height: 43px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:112%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nam ở mỗi nhóm</b></span></span></span></span></td>
			<td style="border-bottom: none; width: 105px; padding: 0cm 0.7px; height: 43px; background-color: white; border-top: 1px solid black; border-right: 1px solid black; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:112%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nữ ở mỗi nhóm</b></span></span></span></span></td>
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			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">3</span></span></span></span></td>
			<td style="border-bottom: none; width: 103px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
			<td style="border-bottom: none; width: 105px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: 1px solid black; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
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			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">5</span></span></span></span></td>
			<td style="border-bottom: none; width: 103px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
			<td style="border-bottom: none; width: 105px; padding: 0cm 0.7px; height: 20px; background-color: white; border-top: 1px solid black; border-right: 1px solid black; border-left: 1px solid black; text-align: center;" valign="top"><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="line-height:115%"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
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			<td style="border-bottom: 1px solid black; width: 103px; padding: 0cm 0.7px; height: 21px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
			<td style="border-width: 1px; border-style: solid; border-color: black; width: 105px; padding: 0cm 0.7px; height: 21px; background-color: white; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:5.5pt"><span style="font-family:&#039;Arial&#039;,&#039;sans-serif&#039;">• • •</span></span></span></span></span></span></td>
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<div style="text-align: justify;"><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></div>

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			<td style="border-bottom: none; width: 103px; padding: 0cm 0.7px; height: 46px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Cách chia</b></span></span></span></span></td>
			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 46px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nhóm</b></span></span></span></span></td>
			<td style="border-bottom: none; width: 102px; padding: 0cm 0.7px; height: 46px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:119%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nam ở mỗi nhóm</b></span></span></span></span></td>
			<td style="border-bottom: none; width: 175px; padding: 0cm 0.7px; height: 46px; background-color: white; border-top: 1px solid black; border-right: 1px solid black; border-left: 1px solid black; text-align: center;"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Số nữ ở mỗi nhóm</b></span></span></span></span></td>
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			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 21px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">3</span></span></span></span></td>
			<td style="border-bottom: none; width: 102px; padding: 0cm 0.7px; height: 21px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">10</span></span></span></span></td>
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			<td style="border-bottom: none; width: 85px; padding: 0cm 0.7px; height: 21px; background-color: white; border-top: 1px solid black; border-right: none; border-left: 1px solid black; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">5</span></span></span></span></td>
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			<td style="border-width: 1px; border-style: solid; border-color: black; width: 175px; padding: 0cm 0.7px; height: 22px; background-color: white; text-align: center;" valign="bottom"><span style="font-size:14pt"><span style="background:transparent"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">6</span></span></span></span></td>
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<div style="text-align: justify;"><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>172. Tìm giao của hai tập hợp A và B biết rằng:</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. A = {mèo, chó}, B = {mèo, hổ, voi}</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. A = {1; 4}, B = {1; 2; 3; 4}</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. A là tập hợp các số chẵn, B là tập hợp các số lẻ</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">a. A </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-2.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;B = {mèo}</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 </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-3.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;B = {1; 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">c. A </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-4.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;B = 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>173. Gọi x là tập hợp các học sinh giỏi văn của lớp 6A, Y là tập hợp các học sinh giỏi toán của lớp 6A. Tập hợp X </b></span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-5.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>&nbsp;Y biểu thị tập hợp nào?</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 x là tập hợp các học sinh giỏi văn của lớp 6A, Y là tập hợp các học sinh giỏi toán của lớp 6A thì tập hợp X </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-6.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;Y biểu thị tập hợp học sinh giỏi cả văn và toán của lớp 6A.</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>174. Tìm giao của hai tập hợp N và N*.</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">N </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-7.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;N* = N*</span></span></span><br  />
<br  />
<strong><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">175. Trên hình bên, A biểu thị tập hợp các học sinh biết tiếng Anh và P biểu thị tập hợp các học sinh biết tiếng Pháp trong một nhóm học sinh.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Có 5 học sinh biết cả hai thứ tiếng Anh và Pháp, 11 học sinh chỉ biết tiếng Anh, 7 học sinh chỉ biết tiếng Pháp.</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. Mỗi tập hợp A, p, A </span></span></span></strong><strong><strong><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-8.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;p có bao nhiêu phần tử?</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. Nhóm học sinh đó có bao nhiêu người? (mỗi học sinh đều biết ít nhất một trong hai thứ tiếng)</span></span></span></strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><i><u>Giải:</u></i></span></span></span></strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. Tập hợp A có: 5 + 11 = 16 (phần tử)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Tập hợp P có: 5 + 7 = 12 (phần tử)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Tập hợp A</span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_10/image-20191008010040-9.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;P có: 5 (phần tử)</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. Nhóm học sinh đó có: 5 + 11 + 7 = 23 (người)</span></span></span></div>
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