x²-y²+x+y
问题描述:
x²-y²+x+y
答
x²-y²+x+y
=(x+y)(x-y)+(x+y)
=(x+y)(x-y+1)
答
x²-y²+x+y
=(x²-y²)+(x+y)
=(x+y)(x-y)+(x+y)
=(x+y) (x-y+1)