计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
问题描述:
计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
答
3(x-y)²/(y-x)³·(x-y)²÷9/y-x
=3/(y-x)× (y-x)³/9
=(y-x)²/3