Trong không gian với hệ trục tọa độ Đềcac vuông góc $Oxyz$ cho các đường thẳng
\(\left( {{D_1}} \right):\frac{{x - 1}}{1} = \frac{{y - 2}}{2} = \frac{{z - 3}}{3};\left( {{D_2}} \right):\left\{ \begin{array}{l}
x + 2y - z = 0\\
2x - y + 3z - 5 = 0
\end{array} \right.\)
Tính khoảng cách giữa hai đường thẳng \(\left( {{D_1}} \right),\left( {{D_2}} \right)\)
\({M_1}\left( {1,2,3} \right) \in \left( {{D_1}} \right);{M_2}\left( {2, - 1,0} \right) \in \left( {{D_2}} \right)\)
\({D_1}\) và \({D_2}\)có các vecto chỉ phương theo thứ tự là \(\overrightarrow {{v_1}}  = \left( {1,2,3} \right);\overrightarrow {{v_2}} \left( {1, - 1, - 1} \right)\).

Mặt phẳng \(\left( \alpha \right)\) chứa \({D_2}\)và song song với \({D_1}\) có phương trình là \(\left( \alpha  \right):x + 4y - 3z + 2 = 0\). Vậy \(d\left( {\left( {{D_1}} \right),\left( {{D_2}} \right)} \right) = d\left( {{M_1},\left( \alpha  \right)} \right) = \frac{2}{{\sqrt {26} }}\)


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