Предмет: Алгебра, автор: superalnon

Докажите тождество 7а(3b+4c)-3a(b+1/3c)=9a(2b+3c)

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Автор ответа: нлоо

7а(3b+4c)-3a(b+1/3c)=9a(2b+3c)
21аb+28ac-3ab-ac=18ab+27ac
18ab+27ac=18ab+27ac
ур-е является тождеством. верно при любом значении неизвестных

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