(+1又档销冲1/4)-(+5)+(-1/3)+(-5又2/3)=[(+1又1/4)-(+5)]+[(-1/3)+(-5又2/3)]=-3又3/4+（-6）行歼斗念=-9又3/4
原誉卖消式=1+1/庆知4-5-1/配氏3-5-2/3=1+1/4-10-1=1/4-10=-9又3/4
