5/8-(1/4+1/3)=5/8-7/12=1/24(4/5+1/5)+1/2=1+1/2=1又1/2
1：5/8-(1/4+1/3)=5/8-7/12=15/24-14/24=1/242:(4/5+1/5)+1/2=1+1/2=3/2
