Ответ:
1)(3m²-m)-(m²-3)+(2m-3)=3m²-m-m²+3+2m-3=2m²+m=m(2m+1)
2)-2mn(m²+4mn-n²)=-2m²n-8m²n²+2mn²=2mn(m-4mn+n)
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Ответ:
1)(3m²-m)-(m²-3)+(2m-3)=3m²-m-m²+3+2m-3=2m²+m=m(2m+1)
2)-2mn(m²+4mn-n²)=-2m²n-8m²n²+2mn²=2mn(m-4mn+n)