简算:(19/91+1919/9191+191919/919191)÷19191919/91919191
问题描述:
简算:(19/91+1919/9191+191919/919191)÷19191919/91919191
答
(19/91+1919/9191+191919/919191)÷19191919/91919191
=19/91×3÷19/91
=3