решите уравнения 2цел 4\7:(0,5х-23\35)=7,5 . 1цел.2\7у-1\2):2,5=5,2 . (1\4+3\4х):0,45=25/36. 22*(17\26х-3\4)=5цел.1\13.

1) 2 4/7 : (0,5х - 23/35) = 7,5
18/7 : (5/10х - 23/35) = 7 5/10
18/7 : (1/2х - 23/35) = 75/10
18/7 : (1/2х - 23/35) = 15/2
1/2х - 23/35 = 18/7 : 15/2
1/2х - 23/35 = 18/7 * 2/15
1/2х - 23/35 = 2/7 * 18/15
1/2х - 23/35 = 2/7 * 6/5
1/2х - 23/35 = (2 * 6)/(7 * 5)
1/2х - 23/35 = 12/35
1/2х = 12/35 + 23/35
1/2х = (12 + 23)/35
1/2х = 35/35
1/2х = 1
х = 1 : 1/2
х = 1 * 2
х = 2

Ответ: 2

2) (1 2/7у - 1/2) : 2,5 = 5,2
(9/7у - 1/2) : 2 5/10 = 5 2/10
(9/7у - 1/2) : 25/10 = 52/10
(9/7у - 1/2) : 5/2 = 26/5
9/7у - 1/2 = 26/5 * 5/2
9/7у - 1/2 = 5/5 * 26/2
9/7у - 1/2 = 1 * 13
9/7у - 1/2 = 13
9/7у = 13 + 1/2
9/7у = 26/2 + 1/2
9/7у = (26 + 1)/2
9/7у = 27/2
у = 27/2 : 9/7
у = 27/2 * 7/9
у = 7/2 * 27/9
у = 7/2 * 3
у = (7 * 3)/2
у = 21/2
у = 10 1/2
у = 10 5/10
у = 10,5

Ответ: 10,5

3) (1/4 + 3/4х) : 0,45 = 25/36
(1/4 + 3/4х) : 45/100 = 25/36
1/4 + 3/4х = 25/36 * 45/100
1/4 + 3/4х = 45/36 * 25/100
1/4 + 3/4х = 5/4 * 1/4
1/4 + 3/4х = (5 * 1)/(4 * 4)
1/4 + 3/4х = 5/16
3/4х = 5/16 - 1/4
3/4х = 5/16 - 4/16
3/4х = (5 - 4)/16
3/4х = 1/16
х = 1/16 : 3/4
х = 1/16 * 4/3
х = 4/16 * 1/3
х = 1/4 * 1/3
х = 1/(4 * 3)
х = 1/12

4) 22 * (17/26х - 3/4) = 5 1/13
22 * (17/26х - 3/4) = 66/13
17/26х - 3/4 = 66/13 : 22
17/26х - 3/4 = 66/22 : 13
17/26х - 3/4 = 3 : 13
17/26х - 3/4 = 3/13
17/26х = 3/13 + 3/4
17/26х = 12/52 + 39/52
17/26х = (12 + 39)/52
17/26х = 51/52
х = 51/52 : 17/26
х = 51/52 * 26/7
х = 26/52 * 51/7
х = 1/2 * 51/7
х = (1 * 51)/(2 * 7)
х = 51/14
х = 3 9/14

Ответ: 3 9/14