作业帮简算：（19/91+1919/9191+191919/919191）÷19191919/91919191
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 00:36:58
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简算：（19/91+1919/9191+191919/919191）÷19191919/91919191
简算：（19/91+1919/9191+191919/919191）÷19191919/91919191
简算：（19/91+1919/9191+191919/919191）÷19191919/91919191
（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+