Предмет: Математика, автор: Алина456789

Найдите неизвестный член пропорции: 7,8 : 2 целых 3/5 = 4 целых 1 /2

natali15medved: в правой части неполная запись, надо знать, на х делить или умножать

Ответы

Автор ответа: prettypushkova

3/5 = 60/100 = 0,6 1/2 = 50/100 = 0,5
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7,8 : 2 3/5 = 4 1/2 : х
7,8 : 2,6 = 4,5 : х это пропорция
7,8 * х = 2,6 * 4,5 свойство пропорции
7,8х = 11,7
х = 11,7 : 7,8
х = 1,5 - неизвестный член пропорции
Проверка: 7,8 : 2,6 = 4,5 : 1,5
3 = 3

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