1/2+3/7=1/5+1/6=0,25+1/20=1/12+5/6=1/2+1/4=7/10-1/2=1/3-1/4=34/45-7/10=0,45-1/4=1/5-1/6=с полным решением пж
1/2+3/7=7/14+6/14=13/14 1/5+1/6=6/30+5/30=11/30 0.25+1/20=25/100+1/20=25/100+5/100=30/100=3/10 1/12+5/6=1/12+10/12=11/12 1/2+1/4=2/4+1/4=3/4 7/10-1/2=7/10-5/10=2/10(=0.2) 1/3-1/4=4/12-3/12=1/12 34/45-7/10=68/90-63/90=5/90 0.45-1/4=45/100-25/100=20/100=2/10(=0.2) 1/5-1/6=6/30-5/30=1/30