cho A=1/101+1/102+1/103+...+1/200
Chứng minh rằng:
a)A>7/12
b)A>5/8
Chứng minh: A > 7/12 và A > 5/8 với A = 1/101 + 1/102 + 1/103 + ... + 1/200
Cho A = 1/101+1/102+1/103+...+1/200
Chứng minh rằng A>7/12
Chứng minh rằng :
a) 7/12 <1/101+1/102+1/103+...+1/200 <1
b) 1/101+1/102+1/103+...+1/150>1/3
cho A =1/101+1/102+1/103+...+1/200
CHUNG TO RANG
A)A>7/12
B) A>5/8
A = \(\dfrac{1}{101}\)+ \(\dfrac{1}{102}\)+\(\dfrac{1}{103}\)+ ... + \(\dfrac{1}{200}\). Chứng minh:
a) A > \(\dfrac{7}{12}\)
b) A > \(\dfrac{5}{8}\)
c) A < \(\dfrac{5}{6}\)
Cho A=1/101+1/102+1/103+...+1/200
CMR: a. A>7/12
b. A>5/8
b) A=1/101+1/102+1/103+...+1/199+1/200. Chứng tỏ rằng A lớn hơn 7/12
Chứng tỏ rằng:
a) 1/101+1/102+1/103+.....+1/149+1/150>1/3
b)1/101+1/102+1/199+1/200>7/12