1) 31/40 + 6/40 = 37/40
2) 4/10+16/40 = 16/40+16/40 = 32/40
3) у = 37/40 - 32/40 = 5/40 = 1/8
Вроде так
1) 31/40 + 6/40 = 37/40
2) 4/10+16/40 = 16/40+16/40 = 32/40
3) у = 37/40 - 32/40 = 5/40 = 1/8
Вроде так