`a)` Ta có: `41/88=(41:1)/(88:1)=41/88` `4141/8888=(4141:101)/(8888:101)=41/88` `414141/888888=(414141:10101)/(888888:10101)=41/88` Vì `41=41=41=>41/88=41/88=41/88=>41/88=4141/8888=414141/888888` Vậy `41/88=4141/8888=414141/888888` `b)` Ta có: `(27425-27)/99900=27398/99900` `(27425425-27425)/99900000=27398000/99900000=(27398000:1000)/(99900000:1000)=27398/99900` Vì `27398=27398=>27398/99900=27398/99900=>(27425-27)/99900=(27425425-27425)/99900000` Vậy `(27425-27)/99900=(27425425-27425)/99900000`
