Доказать, что прямая [tex] \frac{x-1}{2} = \frac{y+2}{3}= \frac{z-1}{6} [/tex] перпендикулярна к прямой [tex] \left \{ {{2x+y-4z+2=0} \atop {4x-y-5z+4=0}} \right. [/tex]

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