Question

已知abc是△ ABC的三边,a^4+b^4+c^4+2a^2b^2-2a^2c^2-2b^2c^2=0,则△ABC是什

Answer 1

化简 等号两边同时x2

(a2-b2)2+(b2-c2)2+(a2-c2)2=0

a=b=c

等边三角形