chứng minh
1) S=\(\frac{1}{21}\)+\(\frac{1}{22}\)+...........+\(\frac{1}{33}\)>\(\frac{1}{2}\)
2) \(\frac{7}{12}\)<\(\frac{1}{21}\)+\(\frac{1}{22}\)+...........+\(\frac{1}{40}\)<\(\frac{5}{6}\)
giúp mk nhé
Chứng minh:
\(\frac{7}{12}<\frac{1}{21}+\frac{1}{22}+\frac{1}{23}+...+\frac{1}{40}<\frac{5}{6}\)
Chứng minh rằng :
\(\frac{7}{12}< \frac{1}{21}+\frac{1}{20}+...+\frac{1}{40}< 1\)
Chú ý p/s thứ 2 là 1/20 chứ k phải 1/22 nha
Chứng minh
a)\(\frac{1}{2}\)<\(\frac{1}{51}\)+\(\frac{1}{52}\)+...+\(\frac{1}{100}\)<1
b)\(\frac{7}{12}\)<\(\frac{1}{21}\)+\(\frac{1}{22}\)+...+\(\frac{1}{40}\)<\(\frac{5}{6}\)
Giúp mk với
Chứng minh:
\(\frac{3}{5}
So sánh K = \(\frac{7}{12}\)
H =\(\frac{1}{21}+\frac{1}{22}+...........+\frac{1}{40}\)
Chứng minh: \(\frac{11}{15}< \frac{1}{21}+\frac{1}{22}+\frac{1}{23}+...+\frac{1}{60}< \frac{3}{2}\).
Chứng minh rằng: \(\frac{11}{15}< \frac{1}{21}+\frac{1}{22}+\frac{1}{23}+...+\frac{1}{59}+\frac{1}{60}< \frac{3}{2}\)
Chứng minh
\(\frac{11}{15}< \frac{1}{21}+\frac{1}{22}+\frac{1}{23}+...+\frac{1}{59}+\frac{1}{60}< \frac{3}{2}\)