Пошаговое объяснение:

№2

а = 10; в = 5 1/8

а - (в - 4 7/32) = 10 - (5 1/8 - 4 7/32) =

10 - (5 4/32 - 4 7/32) = 10 - (4 36/32 - 4 7/32) =

10 - 29/32 = 9 32/32 - 29/32 = 9 3/32

№3

(х - 5 1/12) + 7 5/18 = 9 4/9

х - 5 1/12 = 9 4/9 - 7 5/18

х - 5 1/12 = 9 8/18 - 7 5/18

х - 5 1/12 = 2 3/18

х = 2 3/18 + 5 1/12

х = 2 6/36 + 5 3/36

х = 7 9/36

х = 7 1/4

10 4/15 - (х + 7 1/10) = 2 13/30

х + 7 1/10 = 10 4/15 - 2 13/30

х + 7 3/30 = 10 8/30 - 2 13/30

х + 7 3/30 = 9 38/30 - 2 13/30

х + 7 3/30 = 7 25/30

х = 7 25/30 - 7 3/30

х = 22/30

х = 11/15