[tex]\displaystyle\bf\\\frac{0,01m^{2}-1 }{0,01m^{2}-0,2m+1 }=\frac{(0,1m)^{2}-1^{2} }{(0,1m)^{2}-2\cdot 0,1m\cdot 1+1^{2} } =\\\\\\=\frac{(0,1m-1)\cdot(0,1m+1)}{(0,1m-1)^{2} } =\frac{0,1m+1}{0,1m-1}[/tex]