用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
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![用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0](/uploads/image/z/1773327-39-7.jpg?t=%E7%94%A8%E7%9B%B4%E6%8E%A5%E5%BC%80%E5%B9%B3%E6%96%B9%E6%B3%95%E8%A7%A3%E6%96%B9%E7%A8%8B+%EF%BC%88x-1%EF%BC%89%26%23178%3B-9%3D0+3%EF%BC%88x-1%EF%BC%89%26%23178%3B-27%3D0)
用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
用直接开平方法解方程 (x-1)²-9=0 3(x-1)²-27=0
(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