So sánh S= \(\dfrac{5^2}{20.25}\)+\(\dfrac{5^2}{25.30}\)+...+\(\dfrac{5^2}{295.300}\)với \(\dfrac{1}{4}\)

I= \(\dfrac{18}{2.5}\)+\(\dfrac{18}{5.8}\)+...+\(\dfrac{18}{203.206}\)

H= \(\dfrac{4}{3.5}\)+\(\dfrac{4}{5.7}\)+...+\(\dfrac{4}{97.99}\)

S= \(\dfrac{1}{1}\)+\(\dfrac{1}{1.3}\)+\(\dfrac{1}{3.5}\)+\(\dfrac{1}{5.7}\)+...+\(\dfrac{1}{99.101}\)

S= \(\dfrac{1}{2}\)+\(\dfrac{1}{2.5}\)+\(\dfrac{1}{5.8}\)+\(\dfrac{1}{8.11}\)+...+\(\dfrac{1}{98.101}\)