简算:(19/91+1919/9191+191919/919191)÷19191919/91919191

问题描述:

简算:(19/91+1919/9191+191919/919191)÷19191919/91919191

(19/91+1919/9191+191919/919191)÷19191919/91919191
=19/91×3÷19/91
=3