Автор - Gjvkkb

Помогите пожалуйста. ​

Ответ

Автор - BIEBO

2 (m-1)(n+1)+(m-n)(m-n-2) = 2mn+2m-2n-n+m2 - mn -2m - mn + n2+2n=

-2 + m2 + n2

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