Предмет: Алгебра, автор: ro5m578578an792

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Автор ответа: pushpull

0

Ответ:

в объяснении

Объяснение:

$\displaystyle 1)\quad 3a(a-b)+5b(a+b) = 3a^2-3ab+5ab+5b^2=3a^2+2ab+5b^2\\\\2)\quad 3y(x-y)+y(2y-3x)=3xy-3y^2+2y^2-3xy=-y^2\\\\3)\quad p(p^2-2a)-a(a^2-2p)=p^3-2ap-a^3+2ap=p^3-a^3\\\\4)\quad 3xy(x^2-y^2+7)-5xy(y^2+x^2)=\\\\=3x^3y-3xy^3+21xy-5xy^3-5x^3y=-2x^3y-8xy^3+21xy$

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