计算(9m²/-3m-n)+(n²/n+3m)
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计算(9m²/-3m-n)+(n²/n+3m)
计算(9m²/-3m-n)+(n²/n+3m)
计算(9m²/-3m-n)+(n²/n+3m)
原式=-9m²/(3m+n)+n²/(3m+n)
=-(9m²-n8)/(3m+n)
=-(3m+n)(3m-n)/(3m+n)
=-(3m-n)
=n-3m
我估计你的试子写错了,应该是:9m²/(-3m-n)+n²/(n+3m)
9m²/(-3m-n)+n²/(n+3m)
=n²/(n+3m)-9m²/(3m+n)
=(n²-9m²)/(3m+n)
=(n+3m)(n-3m)/(3m+n)
=n-3m
9m^2/(-3m-n)+n^2/(n+3m)
=(n^2-9m^2)/(n+3m)
=(n+3m)(n-3m)/(n+3m)
=n-3m