Предмет: Математика, автор: aylin080906

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Автор ответа: bityukovps
1

Ответ:

4

Пошаговое объяснение:

Признак делимости числа на 9 - сумма его цифр должна делиться на 9.

a+b = 9 * n, где n - натуральное число

по условию задачи при делении на 9 остаток 5:

a+b  = 9*n + 5

Чтобы превратить число, описываемое формулой 9*n + 5   в делимое на 9 без остатка, нужно увеличить его на 4.

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