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

来源：学生作业学帮网编辑：学帮网时间：2024/05/27 03:19:33

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

-191919/919191-(-19191919/91919191)= -191919/919191-(-19191919/91919191) =-191919/919191+19191919/91919191 =-19*(10000+100+1)/91*(10000+