Пошаговое объяснение:
1)
(19 - х) + 2. 3/4 = 5,5
19 - х = 5,5 - 2. 3/4
19 - х = 5,5 - 11/4
19 - х = 5,5 - 2,75
19 - х = 2,75
х = 19 - 2,75
х = 16,25
2)
25 - (7. 1/8 + х) = 12. 7/12
7. 1/8 + х = 25 - 12. 7/12
7. 1/8 + х = 24. 12/12 - 12. 7/12
7. 1/8 + х = 12. 5/12
х = 12. 5/12 - 7. 1/8
х = 12. 10/24 - 7. 3/24
х = 5. 7/24
3)
18,25 - (17 - х) = 6. 5/6
17 - х = 18,25 - 6. 5/6
17 - х = 18. 25/100 - 6. 5/6
17 - х = 18. 1/4 - 6. 5/6
17 - х = 17. 3/12 - 6. 10/12
17 - х = 16. 15/12 - 6. 10/12
17 - х = 10. 5/12
х = 17 - 10. 5/12
х = 16. 12/12 - 10. 5/12
х = 6. 7/12
4)
(27 - х) - 2,5 = 3. 2/3
27 - х = 3. 2/3 + 2,5
27 - х = 3. 2/3 + 2. 5/10
27 - х = 3. 20/30 + 3. 15/30
27 - х = 6. 35/30
27 - х = 7. 5/30
27 - х = 7. 1/6
х = 27 - 7. 1/6
х = 26. 6/6 - 7. 1/6
х = 19. 5/6
1) 16.25 2) 6 17/24 3) 5 7/12 4) 20 3/4
Пошаговое объяснение:
1)(19 - Х) + 2 3/4= 5.5
19 - Х + 2.75 = 5.5
-Х = 5.5 - 2.75 - 19
-X = -16.25
X = 16.25
2) 25 - (7 1/8 + X) = 12 7/12
25 - 7 1/8 - X = 12 7/12
-X = 12 7/12 + 7 1/8 - 25
-X = 12 14/24 + 7 3/24 - 25
-X = 19 17/24 - 25
-X = -6 17/24
X= 6 17/24
3) 18.25 - (17-X) = 6 5/6
18.25 - 17 + X = 6 5/6
X = 6 5/6 - 18.25 + 17
X = 6 5/6 - 1.25
X = 6 5/6 - 1 1/4
X = 6 10/12 - 1 3/12
X = 5 7/12
4) (27 - X) - 2.5 = 3 2/3
27 - X - 2.5 = 3 2/3
-X = 3 2/3 + 2.5 - 27
-X = 3 2/3 - 24.5
X = 24 5/10 - 3 2/3
X = 24 15/30 - 3 20/30
X = 23 45/30 - 3 20/30
X= 20 15/30
X= 20 3/4
2. а
3. б
4. г