Các câu hỏi tương tự
Chứng minh rằng :\(\frac{23}{34}<\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{70}<\frac{4}{3}\)
Chứng tỏ :\(\frac{23}{34}<\frac{1}{31}+\frac{1}{32}+...+\frac{1}{70}<\frac{4}{3}\)
Chứng tỏ :\(\frac{23}{34}<\frac{1}{31}+\frac{1}{32}+...+\frac{1}{70}<\frac{4}{3}\)
Chứng tỏ rằng :\(\frac{23}{34}<\frac{1}{31}+\frac{1}{32}+...+\frac{1}{70}<\frac{4}{3}\)
Chưng minh rằng:\(\frac{23}{34}<\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{70}<\frac{4}{3}\)
Cho \(S=\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+\frac{1}{34}+...+\frac{1}{60}\)
CMR : \(\frac{3}{5}< S< \frac{4}{5}\)
Chứng tỏ:
\(\frac{31}{2}.\frac{32}{2}.\frac{33}{2}.\frac{34}{2}....\frac{60}{2}=1.3.5....59\)
Chứng minh rằng
\(A=\frac{3}{5}< \frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{60}< \frac{4}{5}\)
Cho B = \(\frac{1}{31}\)+\(\frac{1}{32}\)+\(\frac{1}{33}\)+.....+\(\frac{1}{60}\)
Chứng tỏ rằng \(\frac{3}{5}\)< B<\(\frac{4}{5}\)