题上少个1/24
三分之一+六分之一+十二分之一+1/24+四十八分之一+九十六分之一+一百九十二
=1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/192-1/192
=(1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/192)-1/192
=(1/3+1/6+1/12+1/24+1/48+1/96+1/96)-1/192
=(1/3+1/6+1/12+1/24+1/48+1/48)-1/192
=(1/3+1/6+1/12+1/24+1/24)-1/192
=(1/3+1/6+1/12+1/12)-1/192
=(1/3+1/6+1/6)-1/192
=(1/3+1/3)-1/192
=2/3-1/192
=128/192-1/192
=127/192