Пошаговое объяснение:
1.
1) 6. 2/9 - 5. 5/6 =
6. 4/18 - 5. 15/18 =
5. 22/18 - 5. 15/18 = 7/18
2) 7/18 : (-7/36) = 7/18 * (-36/7) = -36/18 = -2
2.
7х - 10х - 5 = 5х + 15
7х - 10х - 5х = 15 + 5
-8х = 20
х = 20 : (-8)
х = -20/8
х = -2. 4/8
х = -2. 1/2
3.
А)
12х + 10 - 2х = 10х + 10
Б)
6х - 10 + 6х = 12х - 10
