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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
人气:312 ℃ 时间:2020-01-31 03:41:37
解答
(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
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