Предмет: Алгебра, автор: 24школа

помогите пожалуйста номер 685 и 687(б,г,е)

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Автор ответа: allangarsk

687 б) (7y - 4)(2y +3) - 13y = 14y -8y +21y -12 -13y = 14y -12

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