Автор - 1sasha294

СРОЧНО!!!!!!!!!!!!!!!20 балов!!!!!!!!​

Ответ

Автор - yakfedor

Ответ:

(*) = 4m^{4} -15m^{2} n+n^{2}

Объяснение:

(7m^{4} -9m^{2} n+n^{2} )-(*) =3m^{4} +6m^{2} n\(*) = 7m^{4} -9m^{2} n+n^{2}-3m^{4} -6m^{2} n\(*) = 4m^{4} -15m^{2} n+n^{2}\

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