1) 12 : 7 : 50 = 12\7 : 50 = 12\350
2) 24 : 5 = 4.8 = 24\5
3) 7Y : 12\350 = 50X : 24\5
(7Y * 350) \ 12 = (50X * 5) \ 24
2450Y \ 12 = 250X \ 24
4900Y \ 24 = 250X \ 24
4900Y = 250X
X = 4900Y : 250 = 19.6Y
........................................
Y \ X = Y \ 19.6Y = 1 \ 19.6 = 1 : 98\5 = 5 \ 98
ответ 5\98