1)49а^2-b^2-(64a^2+16ab+b^2)=49a^2-b^2-64a^2-16ab-b^2=-15a^2-2b^2-16ab
ответ: -15a^2-2ab^2-16ab
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1)49а^2-b^2-(64a^2+16ab+b^2)=49a^2-b^2-64a^2-16ab-b^2=-15a^2-2b^2-16ab
ответ: -15a^2-2ab^2-16ab