( 6 1/4-4 1/8)*4+3 1/3:2 1/2=
(2 4/9+1 1/6)*1 4/5-3 1/9:2 1/3=
(2-1 7/12):(3/8-1/6)*3 1/4=
(7/10-2/5)*(1/4+5/6):6 1/2=

1) 6 1/4 - 4 1/8 =2 1/82) 3 1/3 : 2 1/2 = 10/3 : 5/2 = 10/3 × 2/5 = 4/3 = 1 1/33)2 1/8 × 4 = 17/8 × 4/1 = 3 1/24) 3 1/2 + 1 1/3 =4 3+2/6 = 4 5/6