给好评啊!!!原式=(x+y)(x-y)+(x-y)(x平方+xy+y平方)=(x-y)(x平方+xy+x+y+y平方)
(X+Y)(X-Y)+(X+Y)(X平方-XY+Y平方)
解x²-y²+x³-y³=(x-y)(x+y)+(x-y)(x²+xy+y²)=(x-y)(x+y+x²+xy+y²)x³-y³=(x-y)(x²+xy+y)立方差公式
x²-y²+x³-y³=(x+y)(x-y)+(x-y)(x²+xy+y²)=(x-y)(x+y+x²+xy+y²)