1/5^2 + 1/6^2 + 1/7^2 + ... + 1/100^2
< 1/4×5 + 1/5×6 + 1/6×7 + ... + 1/99×100
< 1/4 - 1/5 + 1/5 - 1/6 + 1/6 - 1/7 + ... + 1/99 - 1/100
< 1/4 - 1/100 < 1/4 ( đpcm)
CM : \(\frac{1}{6}<\frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+......+\frac{1}{100^2}<\frac{1}{4}\)
chứng minh rằng\(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+.......+\frac{1}{100^2}< \frac{1}{4}\)
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 : \(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+......+\frac{1}{100^2}< \frac{1}{4}\)\(\frac{1}{4}\)
CMR : \(\frac{1}{6}
Chừng minh rằng : \(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+...+\frac{1}{100^2}< \frac{1}{4}\)
\(A=\left(2+4+6+...+100\right)\left(\frac{3}{5}:0,7+3\left(\frac{-2}{7}\right)\right):\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{100}\right)\)
CMR:\(\frac{1}{6}<\frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+.....+\frac{1}{100^2}<\frac{1}{4}\)
Chứng minh :
\(\frac{1}{6}< \frac{1}{5^2}+\frac{1}{6^2}+\frac{1}{7^2}+...+\frac{1}{100^2}< \frac{1}{4}\)
