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x^2+9x/x^2+3x+x^2-9/x^2+6x+9
人气：434 ℃　时间：2020-02-23 07:50:54
解答
=x(x+9)/x(x+3)+(x+3)(x-3)/(x+3)²
=(x+9)/(x+3)+(x-3)/(x+3)
=(x+9+x-3)/(x+3)
=2(x+3)/(x+3)
=2
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