[中學] 兩題向量百思不得其解~~
1.AB向量=(2,-3),AC向量=(x , 1-x) 求三角形ABC的周常最小值?
想法:設點A為(0,0) B(2,-3) C(x,1-x)
並知道 C在 X+Y=1的直線上 利用對稱求出C點,再求周長
不知道這樣做法是否正確,有無更好的做法,不要設到點
2.PO向量=(1,根號3) ,Q點在直線 y+根號3*x-6=0上,且知PQ距離等於2,求PQ向量?
想法:我把O點視為(0,0)硬求出答案,想問有沒有更好的想呢?
謝謝
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