Cho \(S=\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+\frac{1}{34}+...+\frac{1}{60}\)
CMR : \(\frac{3}{5}< S< \frac{4}{5}\)
Cho \(S=\) \(\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+........+\frac{1}{60}\) CMR: \(\frac{3}{5}< S< \frac{4}{5}\)
a) Cho \(s=\frac{3}{10}+\frac{3}{11}+\frac{3}{12}+\frac{3}{13}+\frac{3}{14}\)
CMR 1<s<2, từ đó suy ra s ko phải stn
b) Cho \(s=\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+....+\frac{1}{60}\)
CMR 3/5< s < 4/5
Cho S =\(\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{60}\)
Chứng Minh Rằng \(\frac{3}{5}
\(S=\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{60}\)
So sánh S và 4/5
Chung minh rang:\(\frac{3}{5}< S< \frac{4}{5}\)
Cho S =\(\frac{1}{31}+\frac{1}{32}+\frac{1}{33}+...+\frac{1}{60}\)Chứng minh rằng \(\frac{3}{5}\)<S<\(\frac{4}{5}\)
Chung minh rang \(\frac{3}{5}< S< \frac{4}{5}\)
Cho tổng: S=\(\frac{1}{31}+\frac{1}{32}+...+\frac{1}{60}\) . Chứng minh \(\frac{3}{5}< S< \frac{4}{5}\)