chứng tỏ rằng :
a) 1/201 + 1/202 + 1/203+....+ 1/400 > 1/2
b) 1/201 + 1/202 + 1/203+....+ 1/400 < 1
Chứng minh rằng:
1/201+ 1/202+...+ 1/399+ 1/400>1/2
1<1/5+ 1/6+...+1/16+ 1/17<2
chung to 1/201+1/202+......+1/399+1/400>1/2
Chung to rang: 1/201+1/202+...+1/399+1/400>1/2
chung to rang: 1/201+1/202+...+1/399+1/400 > 1/2
chứng tỏ rằng :
\(\frac{1}{201}+\frac{1}{202}+\frac{1}{203}+....+\frac{1}{400}>\frac{1}{2}\)
chứng tỏ: 1/201 + 1/202 + 1/203 + ... + 1/400 > 1/2. Giúp cho mình với
\(CMR:\frac{1}{201}+\frac{1}{202}+....+\frac{1}{399}+\frac{1}{400}>\frac{1}{2}\)
Chứng minh rằng: \(\dfrac{1}{201}+\dfrac{1}{202}+\dfrac{1}{203}+\dots+\dfrac{1}{400}< \dfrac{5}{6}\)