1.20y(2y-x)²与5x(x-2y)平方的公因式是—— 2.分解因式(x+y)(x-y)-(x+y)²

1.20y(2y-x)²与5x(x-2y)平方的公因式是—— 2.分解因式(x+y)(x-y)-(x+y)²
1.20y(2y-x)²与5x(x-2y)平方的公因式是—— 2.分解因式(x+y)(x-y)-(x+y)²

1.20y(2y-x)²与5x(x-2y)平方的公因式是—— 2.分解因式(x+y)(x-y)-(x+y)²
20y(2y-x)²=20y(x-2y)²、5x(x-2y)²
公因式：5（x-2y)²
（x+y)(x-y)-(x+y)²=（x+y)(x-y-x-y)=(x+y)(-2y)=-2y(x+y)