(x-1)的立方-3=3/8 x等于?

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(x-1)的立方-3=3/8 x等于?

(x-1)的立方-3=3/8
(x-1)的立方-3+3=3/8+3
(x-1)的立方=27/8
(x-1)的立方=(3/2)的立方
两边开立方:
x-1=3/2
x=3/2+1
x=5/2,【x=2.5】

(x-1)³=3/8+3
(x-1)³=(3+24)/8
(x-1)³=27/8
x-1=3/2
x=5/2