Предмет: Математика, автор: Владислав2016

Решите квадратное уравнение подбором корней: z^2+z-20=0; x^2+13x+12+0; y^2-4y-21=0.
ПОМОГИТЕ ПОЖАЛУЙСТА РЕШИТЬ ЗАДАНИЯ ПО МАТЕМАТИКЕ 8 КЛАСС.
СПАСИБО ЗАРАНЕЕ!

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Автор ответа: manyny06

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решение смотри на фотографии

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