△ABC的三边长a,b,c满足下列关系：-c2+a2+2ab-2bc=0,试说明这个三角形是等腰三角形
人气：313 ℃ 时间：2020-01-29 05:02:15
解答
(a+c)(a-c)+2b(a-c)=0
(a-c)(a+c+2b)=0
a+c+2b>0
所以a-c=0
a=c
是是等腰三角形
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