(6m²n-6m²n²-3m²)÷(-3m²)快一点把

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(6m²n-6m²n²-3m²)÷(-3m²)快一点把
(6m²n-6m²n²-3m²)÷(-3m²)
快一点把

(6m²n-6m²n²-3m²)÷(-3m²)快一点把
(6m2n-6m2n2-3m2)/(-3m2)
=(-6m2n+6m2n2+3m2)/3m2
=2n^2-2n+1