(a-1)²;=0,求a等于几
问题描述：
(a-1)²;=0,求a等于几
答
（a - 1）² = 0
∴ a - 1 = 0
a = 1
(a-1)²;=0,求a等于几
（a - 1）² = 0
∴ a - 1 = 0
a = 1