5/3+7/6＝17/61/2+1/3＝5/61/2-1/3＝1/61/2+3/4-3/10=19/202/9+5/6+1/3=25/184/5-3/10+2/3=7/61/2-3/4+3/8=1/85/6-1/3+3/10=1/51/2+1/4+1/6+1/8+1/10=137/1202/3+4/7-3/10=197/2101/4-2/9+4/5-5/9=49/180