Ответы
Ответ:
Решить уравнения .
Применяем правило нахождения неизвестного делителя : чтобы найти неизвестный делитель, надо делимое разделить на частное .
![](https://st.uroker.com/files/380/3808847b910d78aee9fc29ba6811c6b5.png)
![](https://st.uroker.com/files/47e/47e6847584a794b9e4c233a37d3af459.png)
Пошаговое объяснение:
№1
4 4/5 : (3х - 2,5) = 4/17
3х - 2,5 = 4 4/5 : 4/17
3х - 2,5 = 24/5 * 17/4
3х - 2,5 = 6/5 * 17/1
3х - 2,5 = 102/5
3х = 102/5 + 2,5
3х = 204/10 + 25/10
3х = 229/10
х = 229/10 : 3
х = 229/10 * 1/3
х = 229/30
х = 7 19/30
№2
28/29 : (2,5х + 1 3/4) = 4/29
2,5х + 1 3/4 = 28/29 : 4/29
2,5х + 1,75 = 28/29 * 29/4
2,5х + 1,75 = 7/1 * 1/1
2,5х + 1,75 = 7
2,5х = 7 - 1,75
2,5х = 5,25
х = 5,25 : 2,5
х = 2,1
№3
11 1/3 : ((1/2х - 2 1/3) - 1 1/2) = 4/21
(1/2х - 2 1/3) - 1 1/2 = 11 1/3 : 4/21
(1/2х - 2 1/3) - 1 1/2 = 34/3 * 21/4
(1/2х - 2 1/3) - 1 1/2 = 17/1 * 7/2
(1/2х - 2 1/3) - 1 1/2 = 119/2
1/2х - 2 1/3 = 119/2 + 1 1/2
1/2х - 2 1/3 = 122/2
1/2х - 2 1/3 = 61
1/2х = 61 + 2 1/3
1/2х = 63 1/3
х = 63 1/3 : 1/2
х = 190/3 * 2/1
х = 380/3
х = 126 2/3
№4
1/4 : (1 5/9 - (3/8х - 3 1/2)) = 3
1 5/9 - (3/8х - 3 1/2) = 1/4 : 3
1 5/9 - (3/8х - 3 1/2) = 1/4 * 1/3
1 5/9 - (3/8х - 3 1/2) = 1/12
3/8х - 3 1/2 = 1 5/9 - 1/12
3/8х - 3 1/2 = 1 20/36 - 3/36
3/8х - 3 1/2 = 1 17/36
3/8х = 1 17/36 + 3 1/2
3/8х = 1 17/36 + 3 18/36
3/8х = 4 35/36
х = 4 35/36 : 3/8
х = 179/36 * 8/3
х = 179/9 * 2/3
х = 358/27
х = 13 7/27