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先化简,再求值x²-4分之2x+2-x分之1
人气:100 ℃ 时间:2020-06-02 00:08:09
解答
x²-4分之2x+2-x分之1
=2x/(x+2)(x-2)-(x+2)/(x+2)(x-2)
=(x-2)/(x+2)(x-2)
=1/(x+2)
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