8x³+27=0
8x³=-27
x³=-8分之27
x³=(-2分之3)³
x=-2分之3再问你一题，还是求X，（X-1）的3次方-0.125=0(x-1)³-0.125=0(x-1)³=0.125x-1=0.5x=0.5+1x=1.5