Предмет: Математика, автор: yarkovaa

0,7:21/5=х-7,2
С помощью пропорции решите,прошу
С решение
100 баллов дам!

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Ответы

Автор ответа: Danya3001

0

Переводим в дроби
0,7 : ( 21/5 ) = X : 7,2
Приводим к общему знаменателю
( 7/10 ) : ( 42/10 ) = ( 10X / 10 ) : ( 72/10 )
Умножаем на 10
7 : 42 = 10X : 72
Произведение крайних равно произведению средних
72 * 7 = 42 * 10X
420X = 504
X = 1,2

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