-6X(-0.25)X14分之11=6X0.25X14分之11=2分之3X14分之11=28分之33=1又28分之5
=(1-1/51)*(1+1/51)*(1-1/52)*(1+1/52)*..............*(1-1/152)*(1+1/152) =(50/51)*(52/51)*(51/52)*(53/52)*..............*(151/152)*(153/152) 中间约分=(50/51)*(153/152) =75/76