这个可以自己推导一下 x^3+1=(x+1)(x^2-x+1)用x^(1/3)替换x可得x+1=(x^(1/3)+1)[x^(2/3)-x^(1/3)+1]x-1可以用同样的方法展开所以这道题的结果是x^(1/3)-1+x^(2/3)-x^(1/3)+1-[x^(2/3)+x^(1/3)+1]=x^(1/3)-1上面的x^(2/3)是x的2/3次方的意思