用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
问题描述:
用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
答
(x-1)²-9=0
(x-1)²=9
x-1=±3
x=1±3
x=4或x=-2
3(x-1)²-27=0
3(x-1)²=27
(x-1)²=9
x-1=±3
x=1±3
x=4或x=-2