\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)
\(A=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\)
\(A=1-\frac{1}{100}=\frac{99}{100}\)
Có: \(\frac{7}{12}=0,58\left(3\right);\frac{99}{100}=0,99;\frac{5}{6}=0,8\left(3\right)\)
Và: \(0,58< 0,99>0,8\left(3\right)\) ( đề sai bạn ơi )
A= 1/1.2 + 1/3.4 + ... + 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
Chứng minh rằng: 7/12<A<5/6
A=\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{5.6}+...\frac{1}{99.100}\) chung minh \(\frac{7}{12}< A< \frac{5}{6}\)
Cho A = \(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{99.100}\)
Chứng minh rằng : \(\frac{7}{12}< A< \frac{5}{6}\)
Cho A =\(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{99.100}\).
Chứng minh rằng : \(\frac{7}{12}< A< \frac{5}{6}\)
1. Cho A = 1/(1.2)+1/(3.4)+...+1/(99.100).
Chứng minh 7/12 < A <5/6
2.Chứng minh:
1/(1.2)+1/(3.4)+...+1/(49.50)=1/26+1/27+...+1/50
Cho: A = 1/1.2 + 1/3.4 + 1/5.6 + .... +1/99.100
chứng tỏ rằng: 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 \(\frac{7}{12}< A< \frac{5}{6}\)
Chứng minh 7/12< 1/1.2 + 1/3.4 +1/5.6 +...... + 1/99.100 <5/6