Предмет: Алгебра, автор: Аноним

Помогите пожалуйста!!!​

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Ответы

Автор ответа: 2SAnastasiAS2
1

Ответ:

№1=48 и 33

№2=12 и 24

№3=(5;-3)

Объяснение:

№1

Пусть даны числа х и у. Тогда по условию

х+у=81

х-у=15

Решим систему уравнений способом сложения:

2х=96

х=48

Подставим значение х в любое из уравнений:

48-у=15

у=48-15

у=33.

№2

Сумма чисел 36, т. е. х+2х=36 3х=36 х=36:3 х=12 первое число 12, второе число 12*2=24.

№3

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