1. 5 7/12 + 1 1/3 = 2. 6 3/50 - 3 17/75 = 3. 5 6/55 + 3 9/44 - 4 7/22 = 4. 2 1/7 * 2 4/5 = 5. 2 1/16 : 2 5/14 = 6. 3 1/6 : 2 1/9 * 1 5/9 = !

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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