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Ответ

Автор - NataMon

Ответ:

х = 6 1/2

Пошаговое объяснение:

3/х + 1 = 2/5

х = 3*5/2 - 1

х = 15/2 - 1 = 7 1/2 - 1

х = 6 1/2

Проверим:

3 /6 1/2 + 1 = 2/5

3 / 7 1/2 = 2/5

3 * 2/15 = 2/5

2/5 = 2/5

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