2/3+1/2+3/7=2*14/42+1*21/42+3*6/42=67/42=1ц.25/42
3/4+11/12+4/5=3*15/60+11*5/60+4*12/60=148/60=37/15=2ц.7/15
5/12+3/25+1/7=5*175/2100+3*84/2100+1*300/2100=1427/2100
7/8+14/15+15/16=7+30/240+14*16/240+15*15/240=210/240+224/240+225/240=659/240=2ц.179/240
2/5+1/3+3/8=2*24/120+1*40/120+3*15/120=28/120+40/120+45/120=113/120
2/3+1/4+7/12=2*4/12+1*3/12+7*1/12=8/12+3/12+7/12=18/12=3/2=1ц.1/2
4/5+3/4+9/20=4*4/20+3*5/20+9*1/20=16/20+15/20+9/20=40/20=2
1/5+4/15+8/75=1*15/75+4*5/75+8*1/75=15/75+20/75+8/75=43/75
1/8+3/20+7/40=5/40+6/40+7/40=18/40=9/20
5/96+3/16+7/24=5/96+18/96+28/96=51/96=17/32
9/13+5/26+1/78=54/78+15/78+1/78=70/78=35/39
4/15+7/20+3/10=16/60+21/60+18/60=55/60=11/12