试题与答案

设△ABC中,AB=(1,2),AC=(-x,2x)(x>0),当△ABC的周长

题型:填空题

题目:

设△ABC中,
AB
=(1,2)
AC
=(-x,2x)(x>0)
,当△ABC的周长为6
5
时,x的值为______.

答案:

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