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		<h1>Giải Sách bài tập Toán 6 chương 1 bài 3&#x3A; Đường thẳng đi qua 2 điểm</h1>
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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>14. Cho ba điểm A, B, C không thẳng hàng. Kẻ các đường thẳng đi qua các cặp điểm.</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. Kẻ được mấy đường thẳng tất cả.</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. Viết tên các đường đó.</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. Viết tên giao điểm của từng cặp đường thẳng.</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  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 14" height="144" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-14.jpg" width="200" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a. Kẻ được 3 đường thẳng tất cả.</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. Đường thẳng AB, BC, và AC.</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. Đường thẳng AB và AC cắt nhau tại A.</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; Đường thẳng AB và BC cắt nhau tại 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">&nbsp;&nbsp;&nbsp; Đường thẳng BC và AC cắt nhau tại C.</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>15. Cho ba điểm R, S, T thẳng hàng.</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. Viết tên các đường thẳng đi qua ba điểm có thể.</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. Tại sao nói các đường thẳng đó trùng nhau.</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:<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 15" height="59" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-15.jpg" width="250" /></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. Tên các đường thẳng đi qua ba điểm: RS, ST, RT, TR, TS, SR.</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. Các đường thẳng đó trùng nhau vì ba điểm R, S, T thẳng hàng (thực chất 6 đường thẳng là một đường thẳng).</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>16. Vẽ đường thẳng a. Lấy A </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span> a, B </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span> a, C </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span> a, D </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∉</span></span></span></span></span> a. Kẻ các đường thẳng đi qua các cặp điểm.</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. Kẻ được mấy đường thẳng (phân biệt) tất cả?</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. Viết tên các đường thẳng đó.</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. D là giao điểm của những đường thẳng 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:<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 16" height="145" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-16.jpg" width="300" /></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. Kẻ được 4 đường thẳng (phân biệt) tất cả.</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. Tên các đường thẳng đó: AC (a), AD, BD, CD.</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. D là giao điếm của 3 đường thẳng: AD, BD, CD.</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>17. Cho ba đường thẳng. Vẽ hình trong các trường hợp 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"><b>a. Chúng có 1 giao điểm.</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. Chúng có 3 giao điểm.</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. Chúng không có giao điểm 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  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 17" height="175" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-17.jpg" width="500" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>18. Vẽ bốn đường thẳng cắt nhau từng đôi một trong các trường hợp 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"><b>a. Chúng có tất cả 1 giao điểm.</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. Chúng có tất cả 4 giao điểm.</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. Chúng có tất cả 6 giao điểm.</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  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 14" height="168" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-18.jpg" width="500" /><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>19. Vẽ sao năm cánh như hình bên.<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 19" height="154" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-19.jpg" width="212" /></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. Đặt tên cho các giao điểm trên hình bên.</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. Đọc tên các bộ bốn điểm thẳng hàng.</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. Năm đường thẳng cắt nhau từng đôi một cho nhiều nhất mấy giao điểm?</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. Vẽ một hình khác có 5 đường thẳng cắt nhau từng đôi một và cho 10 giao điểm.</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. Các giao điểm trên hình: A, B, C, D, E, F, G, H, I, J (hình 19a).</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. Các bộ bốn điểm thẳng hàng:</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, C, D</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, I, H, J</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, B, I, J</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, C F, G</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, F, H, J.</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. Năm đường thẳng cắt nhau từng đôi một cho nhiều nhất 10 giao điểm.</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. Hình 19b.</span></span></span><br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 19 da" height="198" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-19-da.jpg" width="500" /><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>20. Cho hai điểm A, B.</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. Vẽ đường thẳng đi qua A. Có tất cả bao nhiêu đường thẳng?</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. Vẽ đường thẳng đi qua A và B. Có tất cả bao nhiêu đường thẳng?</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:<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 20" height="37" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-20.jpg" width="151" /></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. Qua điểm A vẽ được vô số đường thẳng, các đường thẳng đó cắt nhau tại A.</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. Qua hai điểm A và B, chỉ vẽ được duy nhất một đường thẳng.</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>21. Cho ba điểm X, Y, Z không thẳng hàng. Ta nói gì về hai đường thẳng XY và XZ?<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 21" height="114" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-21.jpg" width="201" /></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">Hai đường thẳng XY và XZ cắt nhau vì chúng có một điểm chung là X.</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>22. Xem hình dưới và dùng các kí hiệu </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span> hoặc </b><b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∉</span></span></span></span></span> để điền vào chỗ trống cho thích hợp.<br  />
<img alt="giai sbt toan 6 phan hinh hoc bai 1 cau 22" height="105" src="https://sachgiai.com/uploads/news/2019_10/giai-sbt-toan-6-phan-hinh-hoc-bai-1-cau-22.jpg" width="207" /></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">O ... đường thẳng RS.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">R ... đường thẳng ST.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">S ... đường thẳng OT.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">T ... đường thẳng SR.</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">O <b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∉</span></span></span></span></span></b> đường thẳng RS.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">R <b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span></b> đường thẳng ST.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">S <b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span></b> đường thẳng OT.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">T <b><span style="font-size:13.5pt"><span style="background:white"><span style="line-height:115%"><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;"><span style="color:rgb(84, 84, 84);">∈</span></span></span></span></span></b> đường thẳng SR.</span></span></span></div>
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