Предмет: Математика, автор: ангелина48

за 10 одинаковых тетрадок заплатили x р. Блокнот на 7 р. дороже тетради.
1) сколько стоит блокнот ?
2)сколько стоит n блокнотов ?
3)сколько стоит одна тетрадь и один блокнот вместе?

Ответы

Автор ответа: Evreika77

х / 10 + 7 - столько стоит блокнот

n * (x /10 +7) - столько стоят n блокнотов

х/10 + х/10 + 7 = 2х/10 + 7 = х/5 + 7 - стоят 1 тетрадь и 1 блокнот

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