可以這樣想,就是設(shè)法提出x+y+z出來(lái),采用降次的方法,x＾3+y＾3+z＾3=x＾2(x+y+z)+y＾2(x+y+z)+z＾2(x+y+z)-x＾2(y+z)-y＾2(x+z)-z＾2(x+y)=(x＾2+y＾2+z＾2)(x+y+z)-x＾2(y+z)-y＾2(x+z)-z＾2(x+y)=(x＾2+y＾2+z＾2)(...