3(x-1)³-81=0 立方根运算
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3(x-1)³-81=0 立方根运算
3(x-1)³-81=0 立方根运算
3(x-1)³-81=0 立方根运算
3(x-1)³-81=0
3(x-1)³=81
(x-1)³=27
x-1=3
x=3+1
x=4
3(x-1)³-81=0
(x-1)³=27
x-1=3
x=4