Предмет: Математика, автор: илья30011997

Найдите сумму всех трёхзначных натуральных чисел, кратных 5 и которые при делении на 4 дают в остатке 1

Ответы

Автор ответа: troleg

Первое такое число 105, последнее - 985, всего таких чисел

(985 - 105) / 20 + 1 = 45 , поэтому их сумма

S = (985 + 105) / 2 * 45 = 545 * 45 = 24525 .

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