计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
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计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x计算.3(x-y)&
计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x
3(x-y)²/(y-x)³·(x-y)²÷9/y-x
=3/(y-x)× (y-x)³/9
=(y-x)²/3