（1-25%)x=1.5 60%x-3=9.6 (1+1/2)*(1+1/3)*1+1/4)*.*(1+1/99)*(1+1/100)0.75x=1.5 60%x=9.6+3 =2/3*4/3*5/4*6/5*7/6*.*100/99*101/100x=2 0.6x=12.6 =101/2x=21 =50.5