7/12+11/18=21/36+22/36=43/36
2 7/24+3 5/16=2 14/48+3 15/48=5 29/48
6-(7/12-1/15)=6-(35/60-4/60)=6-31/60=5 60/60-31/60=5 29/60
11/12+2/15=55/60+8/60=63/60=1 3/60=1 1/20
2 5/21+1 9/14=2 10/42+1 27/42=3 37/42
5-(9/10-4/15)=5-(27/30-8/30)=5-19/30=4 30/30-19/30=4 11/30
3/4×7=21/4=5 1/4
6/57×9/12=9/114=3/38 и так далее