<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Zjistěte, zda konvergují (divergují) řady:
$$
\sum_{n=1}^{\infty} (-1)^n \frac{2n^2 +3n +4}{2n^2+
5}, \qquad
\sum_{n=1}^{\infty}(-1)^n \frac{2n^2 +3n +4}{(2n^2
+ 5)^2} \qquad.
$$
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