T
tomorrowhero


CMR
[TEX] \frac{1}{6}< \frac{1}{5 ^ 2} + \frac{1}{6 ^ 2}+ \frac{1}{7 ^ 2}+...+ \frac{1}{100 ^ 2 } < \frac{1}{4}[/TEX]
[TEX] \frac{1}{2!}+ \frac{1}{3!}+...+ \frac{1}{100!}< 1[/TEX]
[TEX] \frac{1}{6}< \frac{1}{5 ^ 2} + \frac{1}{6 ^ 2}+ \frac{1}{7 ^ 2}+...+ \frac{1}{100 ^ 2 } < \frac{1}{4}[/TEX]
[TEX] \frac{1}{2!}+ \frac{1}{3!}+...+ \frac{1}{100!}< 1[/TEX]