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(-2a)*5*(-b)+a*7ab-2b*(-3a)*2a

Odpowiedź :

[tex]\fbox{(-2a)* 5*(-b)}+\fbox{a*7ab}\ \fbox{-2b*(-3a)*2a}=10ab+7a^2b+12a^2b=19a^2b + 10ab[/tex]

To co w ramce weź w pętle.