x(x-y)的平方分之y与(y-x)的立方分之x通分,

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x(x-y)的平方分之y与(y-x)的立方分之x通分,
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x(x-y)的平方分之y与(y-x)的立方分之x通分,
x(x-y)的平方分之y与(y-x)的立方分之x通分,

x(x-y)的平方分之y与(y-x)的立方分之x通分,
y/x(x-y)²;x/(y-x)³;
∴分母公因式为x(y-x)3;
∴y/x(x-y)²=y(y-x)/x(y-x)³;x/(y-x)³=x²/x(y-x)³;