化简【(2x/x-3)-(x/x+3)】除(x/9-x^2) .分式化简谢谢····求步骤
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{(2x/x-3)-(x/x+3)}/(x/9-x^2)={[2x(x+3)-x(x-3)]/(x^2-9)}/[x/(9-x^2)]=(x^2+9x)/-x=-(x+9)

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