计算2(x-1)²-1=17,（2x-1）³-1=7
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计算2(x-1)²-1=17,（2x-1）³-1=7计算2(x-1)²-1=17,（2x-1）³-1=7计算2(x-1)²-1=17,（2x-1）&#
计算2(x-1)²-1=17,（2x-1）³-1=7
计算2(x-1)²-1=17,（2x-1）³-1=7
计算2(x-1)²-1=17,（2x-1）³-1=7
2(x-1)²-1=17
(x-1)²-3²=0
(x-1+3)(x-1-3)=0
(x+2)(x-4)=0
x1=-2
x2=4
（2x-1）³-1=7
(2x-1)³=2³
2x-1=2
x=3/2
2(x-1)²-1=17 (x-1)²=9 x=4或x=-2
(2x-1)³-1=7 (2x-1)³=8 x=3/2