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=13/141/5+1/6=6/30+5/30=11/300.25+1/20=25/100+1/20=25/100+5/100=30/100=3/101/12+5/6=1/12+10/12=11/121/2+1/4=2/4+1/4=3/47/10-1/2=7/10-5/10=2/10(=0.2)1/3-1/4=4/12-3/12=1/1234/45-7/10=68/90-63/90=5/900.45-1/4=45/100-25/100=20/100=2/10(=0.2)1/5-1/6=6/30-5/30=1/30