7/8+3/8= 10/8 = 1,2/8
7/12+3/4= 7+9 = 16/12 = 1,4/12
7/12+3/8= 14+9 = 23/24
7/9+3/4= 28+27 = 55/36 = 1,19/36
1,5/36+7,2/9=8 5+8 = 8,13/36
2,3/5+1,5/6=3 18+15 = 33/30 = 1,3/30 = 4,3/30
2,3/20+1,5/6=3 9+50 = 3,59/60
2,5/8+3,4/9+1,7/18=6 45+32+28 = 105/72 = 1,33/72 = 7,33/72