А 7 5/12+ 4 3/8 б 3 11/20+ 2 19/30 в 9 5/6- 2 3/4 г 3 3/10-1 7/15
7 5/12+4 3/8=11 19/24 3 11/20+ 2 19/30=6 11/60 9 5/6-2 3/4=7 1/12 3 3/10-1 7/15=1 5/6