Question

Chưng minh rằq 

1 phần 3 mũ 2 + 1 phần 4 mũ 2 + 1 phần 5 mũ 2+ ....+ 1 phần 100 mũ 2 < 1 phần 2

Bạn nào làm đc thì giúp mk với

Answer 1

\(\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

\(\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)

\(\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{2}-\frac{1}{100}\)

\(\Rightarrow\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{2}\)

Answer 2

  Gọi A = \(\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}\)

=>  A = \(\frac{1}{3.3}+\frac{1}{4.4}+...+\frac{1}{100.100}\)

      A < \(\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)

      A < \(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)

      A < \(\frac{1}{2}-\frac{1}{100}\)

      A < \(\frac{49}{100}< \frac{50}{100}=\frac{1}{2}\)

  =>  A < \(\frac{1}{2}\)

<=>    \(\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{100^2}< \frac{1}{2}\)