Найдите значение выражений
1/2+7/12=6/12+7/12=13/12=1 1/12 2/5+3/7=14/35+15/35=29/35 3/4+1/8=6/8+1/8=7/8 2/7+1/2=4/14+7/14=11/14 14/15-1/3=14/15-5/15=9/15 1/3-5/18=6/18-5/18=1/18 1/2-3/20=10/20-3/20=7/20 1/7-1/10=10/70-7/70=3/70