Решите уравнения: а) 12/x=24/3 б) 0,15/2,8=y/4,2 в) 5 3/5:3 1/2=5 1/4:x

а) 12 / x = 24 / 3

24 * х = 12 * 3

24 * х = 36

х = 36 / 24

х = 6 * 6 / (6 * 4)

х = 1 * 6 / (1 * 4)

х = 6 / 4

х = 3 / 2

х = 1, 5

б) 0, 15 / 2, 8 = y / 4, 2

2, 8 * у = 4, 2 * 0, 15

у = 4, 2 * 0, 15 / 2, 8

у = 0, 63 / 2, 8

у = 0, 225

в) 5 3 / 5 : 3 1/2 = 5 1 / 4 : x

(28 / 5) / (7 / 2) = (21 / 4) / х

28 / 5 * х = 21 / 4 * (7 / 2)

х = (21 * 7) / (4 * 2) / (28 / 5)

х = (21 * 7) / (4 * 2) * 5 / 28

х = (21 * 1) / (4 * 2) * 5 / 4

х = 21 / 8 * (5 / 4)

х = 105 / 32