Предмет: Математика, автор: parvin2002m

При каких значениях nпятизначное число 712n4 делится на 3

Ответы

Автор ответа: natabyl

Если сумма цифр в числе делится на 3, то и все число делится на 3. значит 7+1+2+n+4=14+n , n=1, так как ближайшее число, которое делится на 3, это 15.
Проверим: 7+1+2+1+4=15
71214:3=23738
число поделилось без остатка

Ответ: n=1

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