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分式:m²-3m/9-m²
人气:365 ℃ 时间:2019-12-01 13:28:11
解答
m²-3m/9-m²
=m(m-3)/(3-m)(3+m)
=-m(3-m)/(3-m)(3+m)
=-m/3+m 同项相消
答:原式为-m/m+3
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