3/10 + 1/2 = 3/10 + 5/10 = 8/10 = 4/5
2/9 + 0 = 2/9
19/75 - 11/50 = (192)/(752) - (113)/(503) = 38/150 - 33/150 = 5/150 = 1/30
11/14 + 8/21 = (113)/(143) + (82)/(212) = 33/42 + 16/42 = 49/42 = 7/6
3/10 + 1/2 = 3/10 + 5/10 = 8/10 = 4/5
2/9 + 0 = 2/9
19/75 - 11/50 = (192)/(752) - (113)/(503) = 38/150 - 33/150 = 5/150 = 1/30
11/14 + 8/21 = (113)/(143) + (82)/(212) = 33/42 + 16/42 = 49/42 = 7/6