Решите уровнение 1) 19/20 - x =1/4
2) x + 3/20=7/10 + 1/4
3) 3/4 - (x + 1/20) = 1/5
4) (x - 1/2)-3/16=1/80
5) 3/2 - (x - 1/21) = 2/7
6)(21/34 - x) - 10/17=1/85
7) 7*(21+x)=175
8)(x-46):61=1​

УрАвнение

1) 19/20 - x =1/4
-х = 1/4 - 19/20
-х = 5/20 - 19/20
-х = - 14/20
х = 14/20
х = 7/10

2) x + 3/20=7/10 + 1/4
х + 3/20 = 14/20 + 5/20
х + 3/20 = 19/20
х = 19/20 - 3/20
х = 16/20 = 4/5

3) 3/4 - (x + 1/20) = 1/5
3/4 - х - 1/20 = 1/5
15/20 - х - 1/20 = 4/20
-х + 14/20 = 4/20
-х = 4/20 - 14/20
-х = -10/20
х= 10/20 = 1/2

4) (x - 1/2)-3/16=1/80
х - 1/2 - 3/16 = 1/80
х - 8/16 - 3/16 = 1/80
х - 11/16 = 1/80
х = 1/80 + 11/16
х = 1/80 + 55/80
х = 56/80 = 7/10

5) 3/2 - (x - 1/21) = 2/7
3/2 - х + 1/21 = 2/7
-х + 63/42 + 2/42 = 12/42
-х + 65/42 = 12/42
-х = 12/42 - 65/42
-х = - 53/42
х = 53/42 = 1 11/42

6)(21/34 - x) - 10/17=1/85
21/34 - х - 10/17 = 1/85
-х + 21/34 - 20/34 = 1/85
-х + 1/34 = 1/85
-х = 1/85 + 1/34
-х = 1/(17•5) + 1/(17•2)
-х = 2/170 + 5/170
-х = 7/170
х = -7/170

7) 7•(21+x)=175
21 + х = 175 : 7
21 + х = 25
х = 25 - 21
х = 4

8) (x-46):61=1
х - 46 = 61
х = 61 + 46
х = 107