._._._._._._._._._.
-0,75
1,375
Пошаговое объяснение:
1 1/2 + х = 3/4
1 2/4 + х = 3/4
х = -3/4 = -0,75
2 3/4 - х = 7/2
2 3/4 - х = 3 2/4
х + 1 1/8 = 2 1/2
х + 1 1/8 = 2 4/8
х = 1 3/8 = 1,375
