Пошаговое объяснение:
1) 9 3/7 + 2/7 = 66/7 + 2/7 = 68/7 = 9 5/7 = 9,714258
2) 5/22 + 3 17/22 = 5/22 + 83/22 = 4
3) 3 3/5 + 2 1/5 = (3+2) + ( 3/5 + 1/5) = 5 + 4/5 = 5 4/5 = 29/5 = 5,8
