当x为何值时,向量a=（2,3）与向量b=（x,-6）平行?、
当x为何值时,向量a=（2,3）与向量b=（x,-6）平行?、
数学人气：631 ℃时间：2020-01-30 15:20:38
优质解答
向量a‖bb=ya.(y∈R,y≠0).===>(x,-6)=y(2,3)=(2y,3y).===>x=2y,-6=3y,===>x=-4,y=-2,===>x=-4,
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