x³-8=03(x+2)³-81=0512-27x³=0x³-3=8分之3
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x³-8=03(x+2)³-81=0512-27x³=0x³-3=8分之3
x³-8=0
3(x+2)³-81=0
512-27x³=0
x³-3=8分之3
x³-8=03(x+2)³-81=0512-27x³=0x³-3=8分之3
1.x³-8=0
x=2
2.3(x+2)³-81=0
(x+2)³=27
x+2=3或x+2=-3
x=1或x=-5
3.512-27x³=0
27x³=512
x³=512/27
x=8/3
4.x³-3=8分之3
x³=8分之27
x=2分之3
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