Найдите неизвестный член пропорции. 1) x:8=15:30 2) х/7=5/2 3) 25:10=х: 4 4) 64:2=128:х 5) 18/х=3/24

1) x : 8 = 15 : 30

x = (15 : 30) * 8

x = 4

2) x / 7 = 5 / 2

x = (7 * 5) / 2

x = 35 / 2

x = 17,5

3) 25 : 10 = x : 4

x = (25 : 10) * 4

x = 2,5 * 4

x = 10

4) 64 : 2 = 128 : x

32 = 128 : x

x = 128 : 32

x = 4

5) 18 / x = 3 / 24

x = (18 * 24) / 3

x = 432 / 3

x = 144