Question

(x+y)^2（x-y)^3-(-x-y)^3（y-x)^2

这道题怎么做啊？好的追加悬赏 哈哈 急啊

Answer 1

(x+y)²(x-y)³-(-x-y)³(y-x)²
=(x+y)²(x-y)³+(x+y)³(x-y)²
=(x+y)²(x-y)²[(x-y)+(x+y)]
=(x+y)²(x-y)²(2x)
=2x(x+y)²(x-y)²

Answer 2

(x+y)²（x-y)³-(-x-y)³（y-x)²
=(x+y)²(x-y)²(x-y+x+y)
=2x(x²-y²)²