x4n次方-y4n次方我知道答案，我想要过程，不好意思(x+y)(x-y)(x²+y²)(x4次方+y4次方)一直乘到(x2n次方+y2n次方)=(x²-y²)(x²+y²)(x4次方+y4次方)一直乘到(x2n次方+y2n次方)=(x^4-y^4)(x^4+y^4)·····(x^2n+y^2n)=x^4n-y^4n