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x²-4分之4 + x+2分之1 化简计算
人气:278 ℃ 时间:2020-05-13 11:57:11
解答

4/(x²-4)+1/(x+2)
=4/(x-2)(x+2)+(x-2)/(x-2)(x+2)
=[4+(x-2)]/(x-2)(x+2)
=(x+2)/(x-2)(x+2)
=1/(x-2)
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