解方程 9(x-1)^3+72=0
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解方程 9(x-1)^3+72=0
解方程 9(x-1)^3+72=0
解方程 9(x-1)^3+72=0
9(x-1)³=-72
(x-1)³=-8
x-1=-2
∴x=-1
9(x-1)^3+72=0
(x-1)³=8
x-1=2
x=3
9(x-1)³+72=0
9(x-1)³=-72
(x-1)³=-8
x-1=-2
x=-1