1) 1 1/2 + 2 2/3 + 3 3/4 = 3/2+8/3+15/4=18/12+32/12+45/12=95/12=7 11/12

2) 95/12*3 3/5 = 95/12*18/5=19/2*3=57/2=28 1/2

3) 14 7/8 : 2 1/3 = 119/8 : 7/3 = 119*3/(8*7)=17*3/8=51/8=6 3/8

4) 8 3/4 - 6 3/8 = 2 6/8 - 3/8 = 2 3/8

5) 28 1/2 : 2 3/8 = 57/8 : 19/8 = 3