Các câu hỏi tương tự
Tính tỉ số A/B biết:
A= 1/1*2+1/3*4+1/5*6+...+1/199+200
B= 1/101*200+1/102*199+...+1/200*101
chứng minh rằng
a,1\101+1\102+...+1\199+1\200 <1
b,1\101+1\102+...+1\149+1\150>1\3
c,1\101+1\102+...+1\199+1\200>7\12
Tính các tổng sau:
a) A = 1*2+2*3+3*4+...+2014*2015
b) B = 101^2+102^2+...+199^2+200^2
c) C = 1*3+2*4+3*5+4*6+...+99*101+100*102
chứng minh.1-1/2+1/3-1/4+1/5-1/6+...1/199-1/200=1/101+1/102+1/103+...+1/200
chứng tỏ phân số 1-1/2+1/3-1/4+...+1/199-1/200=1/101+1/102+...+1/200
1-1/2+1/3+1/4+...+1/199+1/200=1/101+1/102+1/103+...+1/200
Chung minh rang:
a,1-1/2+1/3-1/4+...+1/199-1/200=1/101+1/102+...+1/200
CMR:1/101+1/102+1/103+...+1/200=1-1/2+1/3-1/4+...+1/199-1/200
CMR: 1-1/2+1/3-1/4+...+1/199-1/200=1/101+1/102+1/103+...+1/200