7/12-5/12=2/12=1/6
9/10+3/10=12/10=6/5=1целая 1/5
1/18+11/18=12/18=2/3
11/15-2/15=9/15=3/5
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5/24+3/8=5/24+9/24=14/24=7/12
7/10-2/5=7/10-4/10=3/10
3/4-2/5=15/20-8/20=7/20
8/11+1/2= 16/22+11/22=27/22=1целая 5/22