Решение:
а) 5 1/8 - 2 1/4 = (41/8 - 9/4) = (41/8 - 18/8) = 23/8 = 2 7/8
б) 3 7/16 + 9 8/8 = (55/16 + 72/8) = (55/16 + 144/16) = 199/16 = 12 7/16
в) 5/6 · 3/11 = (15/66) = 5/22
г) 1 1/3 : 2 2/9 = (4/3) : (20/9) = (4/3) · (9/20) = 36/60 = 3/5
Ответы: а) 2 7/8, б) 12 7/16, в) 5/22, г) 3/5.