Предмет: Математика, автор: polinazaykott

До числа 41 припиши ліворуч таку цифру, щоб утворене число ділилося на 9.​

Ответы

Автор ответа: Guppy2016
1

признак делимости на 9 - сумма цифр числа должна делиться на 9.

4+1=5 - сумма цифр

5:9=0(ост 5)

9-5=4 нужно прибавить до делимости на 9,подходит однозначное

414

следующее кратное 9  - 9*2=18

18-5=13 - не подходит,двухзначное.это число.а не цифра

дальше числа больше будут рассматривать нет смысла

polinazaykott: спасибо !!
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