(3mn-n²) (m²+2mn)=n(3m-n)·m(m+2n)=mn(3m²+6mn-nm-2n²)=
mn(3m²+5mn-2n²)=3m³n+5m²n²-2n³m
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(3mn-n²) (m²+2mn)=n(3m-n)·m(m+2n)=mn(3m²+6mn-nm-2n²)=
mn(3m²+5mn-2n²)=3m³n+5m²n²-2n³m