1)the two friends lived in liverpool, didn't they? 2)the boys didn't like doing sums, did they? 3)the river mersey was far busier in the old days, wasn't it? 4)the narrator's relatives had seen a lot of parts of the globe, hadn't they? 5)the boys were not teenagers at the time, were they? 6)the boys tried to plan their voyage, didn't they? 7)the boys didn't prepare food and drink for their voyage, did they? 8)the boys could easily get on board the ship, couldn't they? 9)the boys had to give themselves up after midge got sick, didn't they? 10)the narrator's parents didn't believe his story, did they?
То такое 3а? Если а - натуральное, то 3а = 3 (а = 1) 3а = 6 ( а = 2) 3а = 9 ( а = 3) ... Что такое 2а? Если а - натуральное, то 2а = 2 (а = 1) 2а = 4 ( а = 2) 2а = 6 ( а = 3) ... Теперь проверяем: 1) а = 1 Числа 3 и 2. Между ними нет ни одного натурального числа. (чисел 0) 2)а = 2 Числа 6 и 4. Между ними стоит число 5 (чисел 1) 3) а = 3 Числа 9 и 6. Между ними стоят числа 7 и 8 (чисел 2) ответ: Между числами 2а и 3а находится а -1 чисел.
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