计算：[x/(x^-3x)](x^2-9)

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计算：[x/(x^-3x)](x^2-9)计算：[x/(x^-3x)](x^2-9)计算：[x/(x^-3x)](x^2-9)原式=[x/x(x-3)](x+3)(x-3)=(x+3)(x-3)/(x

计算：[x/(x^-3x)](x^2-9)
计算：[x/(x^-3x)](x^2-9)

计算：[x/(x^-3x)](x^2-9)
原式=[x/x(x-3)](x+3)(x-3)
=(x+3)(x-3)/(x-3)
=x+3

你好：
={x/(x*(x-3))}*(x+3)*(x-3)
={1/(x-3)}*(x+3)*(x-3)
=x+3

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