chứng minh : \(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+...+\frac{1}{10^2}\) bé hơn 1
\(\frac{1}{2^2}+\frac{1}{4^2}+\frac{1}{6^2}+...+\frac{1}{100^2}< \frac{1}{2}\)
CMR :tổng trên bé hơn \(\frac{1}{2}\)
Cho:\(A=\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+.....+\frac{1}{31}\) CHỨNG MINH A BÉ HƠN 4
1.chứng minh rằng : \(\frac{1}{2}!+\frac{2}{3}!+\frac{3}{4}!+...+\frac{99}{100}!< 1\)
2. Chứng minh rằng :\(\frac{1.2-1}{2}+\frac{2.3-1}{3}+\frac{3.4-1}{4}+...+\frac{99.100-1}{100}< 2\)
chứng minh rằng\(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+.......+\frac{1}{100^2}< \frac{1}{4}\)
chứng minh rằng:\(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+.......+\frac{1}{100^2}< \frac{1}{4}\)
Cho \(A=\frac{1}{2^2}+\frac{1}{2^4}+\frac{1}{2^6}+...+\frac{1}{2^{100}}\)
Chứng minh rằng \(A< \frac{1}{3}\)
A= \(\frac{1}{2^2}+\frac{1}{2^4}+\frac{1}{2^6}+...+\frac{1}{2^{100}}\)
chứng minh : A < \(\frac{1}{3}\)
Cho \(A=\frac{1}{2^2}+\frac{1}{2^4}+\frac{1}{2^6}+...+\frac{1}{2^{100}}\). Chứng minh \(A< \frac{1}{3}\)