№2. 1) x: 2 5/7 = 10 : 5/21 2) 1 1/2 : 13 = x : 4 1/3 3) 10 : 1/8 = x : 1 1/4

Question

Вопрос:

Ответ:

Accepted Answer

1) x : 2 5/7 = 10 : 5/21
x : 19/7 = 10 : 5/21
x = (19/7 * 10) / (5/21) = (190/7) * (21/5) = (190 * 21) / (7 * 5) = 3990 / 35 = 114
Ответ: x = 114
2) 1 1/2 : 13 = x : 4 1/3
3/2 : 13 = x : 13/3
3/26 = x : 13/3
x = (3/26 * 13/3) = 39 / 78 = 1/2
Ответ: x = 1/2
3) 10 : 1/8 = x : 1 1/4
10 : 1/8 = x : 5/4
80 = x : 5/4
x = 80 * 5/4 = 400 / 4 = 100
Ответ: x = 100