9-m²分之m²-3m(化简)

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9-m²分之m²-3m(化简)

9-m²分之m²-3m(化简)
9-m²分之m²-3m(化简)

9-m²分之m²-3m(化简)
原式=-(m²-9)分之(m²-3m)
=-(m+3)(m-3)分之m(m-3)
=-(m+3)分之m

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

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

原式=[m(m-3)]/[(3+m)(3-m)]
=m/(-3-m)
=-m/(m+3)