证明下列三点共线 :A(1,2)B (-3,-4) C (2,3.5) {
人气:107 ℃ 时间:2020-09-12 06:05:06
解答
证明:
向量AB=(-4,-6)
向量BC=(5,7.5)
经过计算:
向量AB=-1.25向量BC
又∵有公共点B
∴ABC三点共线
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