Ответ:(3m-4n)(3m+5n)-2(5m-n)(2m+4n)=9m^2+15mn-12mn-20n^2-2(1Om^2+20mn-2nm-4n^2)=9m^2+3mn-20n^2-20m^2-40mn+4nm+8n^2=-11m^2-33mn-12n^2
Объяснение:
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Ответ:(3m-4n)(3m+5n)-2(5m-n)(2m+4n)=9m^2+15mn-12mn-20n^2-2(1Om^2+20mn-2nm-4n^2)=9m^2+3mn-20n^2-20m^2-40mn+4nm+8n^2=-11m^2-33mn-12n^2
Объяснение: