Решение:
5/х 1/2=2
Приведём уравнение к общему знаменателю 2*х=2х
2*5 -х*1=2х*2
10-х=4х
4х+х=10
5х=10
х=10: 5
х=2
Ответ6 х=2
4/15 + 3/5 = 4/15 + 9/15 = 13/15
3/8 + 7/20 = 15/40 + 14/40 = 29/40
3/16 + 1/24 = 9/48 + 2/48 = 11/48
1 9/14 + 2 1/7 = 2 + (9/14 + 1/7) = 2 + (9/14 + 2/14) = 2 + 11/14 = 2 11/14
1 5/8 + 2 9/16 = 3 + (5/8 + 9/16) = 3 + (10/16 + 9/16) = 3 + 19/16 = 4 3/16
7/10 - 1/2 = 7/10 - 5/10 = 2/10 = 1/5
13/20 / 3/8 = 26/40 - 15/40 = 11/40
(100011 - 99996) x 3 = 15:3 = 5
1. 27 1/5 *3*60=27 1/5 *180= 136/5 *180=24480/5= 4896
2. 27 1/5 *75=136/5 *75=10200/5 =2040
3. 27 1/5 * 40 = 136/5 *40 = 5440/5 =1088