1)5 7/12+1 1/3=(5+1)+(7/12+1/3)=6+11/12=6 11/12
2) 6 3/50-3 17/15=303/50-242/75=17/6
3)5 6/55+9/44-4 7/22=281/55+141/44-95/22=879/220
4)2 1/7*2 4/5=15/7*14/5=3*2=6
5)2 1/6:2 5/14=33/16:33/14=33/16*14"33=1/8*7=7"8
6)3 1/6:2 1/9*1 5/9=19/6:19/9*14/9=19/3*9/19*7/9=1/3*7=7/3