计算(x²-y²)(x+y)÷(x+y)²等于

计算(x²-y²)(x+y)÷(x+y)²等于 计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² (x-y)³(x-y)²(y-x)等于多少 利用公式计算(x²-y²)÷(x+y) 计算：(x+y)²-4(x+y)(x-y)+4(x-y)² 计算(x²/x+2y)-x+2y-2 (x-y)的四次方(x-y)-2(x-y)²(y-x）³等于? 数学计算(x²-y²)(x+y)÷(x+y)² [(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做? 计算4（x+y）^5（x-y）^4÷[2（x+y）³*（y-x）²] （x-2y)³÷（2y-x)²为什么等于x-2y? (x+y)²-(x³+y³)÷(x+y)等于?