算一道向量题,急
问题描述:
算一道向量题,急
F(-1,0) P(5,t) Q(x,y)
2倍向量FP+3倍向量PQ=0
2(6,t)+3(x-5,y-t)=0
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``````````````过程是什么?
x=1
一楼那部我会
答
2*(6,t) + 3* (x-5 ,y-t) =0
即(12 ,2t) + (3x-15 ,3y-3t ) =0
则
12 + (3x -15) =0 x=1
2t + (3y -3t) =0 3y -t =0