分式:m²-3m/9-m²

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分式:m²-3m/9-m²
分式:m²-3m/9-m²

分式:m²-3m/9-m²
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

　　-m(3-m)/(3-m)(3+m),化简得：-m/(3+m)

m²-3m/9-m² ＝m(m-3)/-(m+3)(m-3)=-m/(m+3)