(3m-4)²=(4m-3)²
问题描述：
(3m-4)²=(4m-3)²
答
m=+1/-1
答
(4m-3)²-(3m-4)²=0
(4m-3+3m-4)(4m-3-3m+4)=0
7(m-1)(m+1)=0
m=1,m=-1