Предмет: Математика, автор: нет13

найдите неизвестный член пропорции: а)x/6=40/48; б) 12,3/6=x/4,2

Ответы

Автор ответа: prettypushkova

х/6 = 40/48
х * 48 = 6 * 40 - свойство пропорции
48х = 240
х = 240 : 48
х = 5
Проверка: 5 : 6 = 40 : 48
0,8(3) = 0,8(3)

12,3/6 = х/4,2
12,3 * 4,2 = 6 * х - свойство пропорции
6х = 51,66
х = 51,66 : 6
х = 8,61
Проверка: 12,3 : 6 = 8,61 : 4,2
2,05 = 2,05

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