Предмет: Алгебра, автор: irinkakokoska48

задумали число от этого числа отняли 213 и получили число которое на 55 меньше половины задуманного числа.найдите задуманное число

Ответы

Автор ответа: Zombynella
171

Ответ:

В решении.

Объяснение:

х - задуманное число.

По условию задачи уравнение:

х - 213 = х/2 - 55

Умножить уравнение на 2, чтобы избавиться от дроби:

2х - 426 = х - 110

2х - х = -110 +426

х= 316 - задуманное число.

Проверка:

316-213=103

316/2-55=103

103=103, верно.

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