Cho: A = 1/1.2 + 1/3.4 + 1/5.6 + .... +1/99.100
chứng tỏ rằng: 7/12 < A < 5/6
cho A= 1/1.2 + 1/3.4 + 1/5.6 + ... + 1/99.100
a, chứng tỏ : A= 1/51 + 1/52 + 1/53 + ... + 1/99.100
b, chứng tỏ 7/12< A< 5/6
Cho A=1/1.2+1/3.4+1/5.6+...+1/99.100
Chứng minh rằng: 7/12<A<5/6
Cho A=1/1.2+1/3.4+1/5.6+...+1/99.100,CMR:7/12<A<5/6
cho A = \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}\)
Chứng minh rằng \(\frac{7}{12}< A< \frac{5}{6}\)
Cho: A= 1/1.2+1/3.4+1/5.6+.....+1/99.100
CMR: 7/12<A<5/6.
Cho A=1/1.2 + 1/3.4 + 1/5.6 +...+1/99.100
CMR 7/12 < A<5/6
Chứng minh 7/12< 1/1.2 + 1/3.4 +1/5.6 +...... + 1/99.100 <5/6
a) A = 1/1.2+ 1/3.4+ 1/5.6+...+ 1/99.100
CMR: 7/12<A< 5/6
b) CMR: 1/1.2+ 1/3.4+ 1/5.6+...+1/49.50 = 1/26+ 1/27+ 1/28+...+1/50