Предмет: Математика, автор: dgjcjgjgkd

700-(×+120)=400 45÷×=(584-579)

Ответы

Автор ответа: prettypushkova

9

700 - (х + 120) = 400 45 : х = 584 - 579

х + 120 = 700 - 400 45 : х = 5

х + 120 = 300 х = 45 : 5

х = 300 - 120 х = 9

х = 180 - - - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - Проверка:

Проверка: 45 : 9 = 584 - 579

700 - (180 + 120) = 400 5 = 5

700 - 300 = 400

400 = 400

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