Задача по математике. За 3 книги и 5 тетрадей заплатили 95 рублей, за 1 книгу и 2 тетради - 33 рубля. Сколько стоит 1 тетрадь?

Задача по математике. За 3 книги и 5 тетрадей заплатили 95 рублей, за 1 книгу и 2 тетради - 33 рубля. Сколько стоит 1 тетрадь?
- Предмет:
  Математика
- Автор:
  regan
- 5 лет назад

Ответы 2

1)3(33-2x)+5x=9599-6x+5x=95 -6x+5x=95-99 -x=-3 x=3 ; 2) y=33-2*3 y=33-6 y=27 Ответ: одна тетрадь стоит 27 рублей
- Автор:
  ellathompson
- 5 лет назад
- 0
Ответ: 1 тетрадь стоит 27 рублей
Пошаговое объяснение:
$\left \{ {{3y+5x=95} \atop {y+2x=33}} ight.$
$\left \{ {{3y+5x=95} \atop {y=33-2x}} ight.$ 1)3(33-2x)+5x=95
99-6x+5x=95 -6x+5x=95-99 -x=-3 x=3 ; 2) y=33-2*3 y=33-6 y=27
- Автор:
  bandit67
- 5 лет назад
- 0
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Задача по математике. За 3 книги и 5 тетрадей заплатили 95 рублей, за 1 книгу и 2 тетради - 33 рубля. Сколько стоит 1 тетрадь?​

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Задача по математике. За 3 книги и 5 тетрадей заплатили 95 рублей, за 1 книгу и 2 тетради - 33 рубля. Сколько стоит 1 тетрадь?