化简分式① 2x³(y-x)³/4y(x-y)²①2x³(y-x)³/4y(x-y)²②-x²+ 6x-9/x²-9

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化简分式① 2x³(y-x)³/4y(x-y)²
①2x³(y-x)³/4y(x-y)²
②-x²+ 6x-9/x²-9

①-y²(x-y)/2
②- x-3/x+3