C
caidogme


cho x=0,999.......
\Rightarrow 10x=9,999.......
\Rightarrow 10x-x = 9,999......-0,999........
\Rightarrow 9x=9
\Rightarrow x=1
\Rightarrow 0,999...... =1 what?
\Rightarrow 10x=9,999.......
\Rightarrow 10x-x = 9,999......-0,999........
\Rightarrow 9x=9
\Rightarrow x=1
\Rightarrow 0,999...... =1 what?