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	Các bình luận về: Đề: Trong không gian với hệ tọa độ Oxyz, cho hai đường thẳng \({d_1}:\left\{ \begin{array}{l} x = 1 + mt\\ y = t\\ z = &#8211; 1 + 2t \end{array} \right.\) và  \({d_2}:\left\{ \begin{array}{l} x = 1 &#8211; t\\ y = 2 + 2t\\ z = 3 &#8211; t \end{array} \right.\). Với giá trị nào của m thì \(d_1\) và \(d_2\) cắt nhau?	</title>
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