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化简x²-3x/9-x²和a²+ab/a²-b²
人气:442 ℃ 时间:2020-06-03 13:08:23
解答
(x²-3x)/(9-x²)
=x(x-3)/(3+x)(3-x)
=-x/(x+3)
(a²+ab)/(a²-b²)
=a(a+b)/(a+b)(a-b)
=a/(a-b)
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