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x^2-12x+20/4-x^2=
人气:209 ℃ 时间:2020-08-31 03:22:24
解答
x^2-12x+20/4-x^2
=(x-10)(x-2)/[(2-x)(2+x)]
=-(x-10)/(x+2)_
=(10-x)/(x+2)
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