Предмет: Математика, автор: Аноним

Решение задач уравнением.К некоторому числу приписали справа ноль(нуль).Число увеличилось на 405. Найдите исходное число.

Ответы

Автор ответа: Малинка2012

исходное число - х

10х=х+405

9х=405

х=45 - исходное число

проверяем: 450-45=405

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