Пошаговое объяснение:
а)
(7 1/8-х)+2 3/8=5 7/8.
7 1/8 - x = 5 7/8 - 2 3/8
7 1/8 - x = 3 4/8
x = 7 1/8 - 3 4/8
x = 3 5/8
б)
14 7/9-(у+8 8/9)=4 2/9
y + 8 8/9 = 14 7/9 - 4 2/9
y + 8 8/9 = 10 5/9
y = 10 5/9 - 8 8/9
y = 1 6/9
y = 1 2/3
