đề có vấn đề nhé bn 1/22;1/23;....;1/1002 thì dãy số ko có quy luật
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CMR 100 - ( 1 + 1/2 + 1/3 + ... + 1/100 ) = 1/2 + 2/3 + ... + 99/100.
cmr 100-(1+1/2+1/3+...+1/100)=1/2+2/3+...+99/100
CMR:(1+1/2+1/3+1/4+...+1/100)=1/2=2/3+3/4+...+99/100
Bài 4 :
a,Cho A= 1/2!+1/3!+.....+1/100!
CMR A<1
b, CMR :1-1/2+1/3-1/4+...+1/99-1/100=1/51+1/52+....+1/100
CMR:
a)1/10^2 +1/11^2+1/12^2+...+1/100^2 >3/4
b)1/2^2+1/3^2+1/4^2+...+1/100^2<99/100
c)1/2^2+1/3^2+1/4^2+...+1/100^2<3/4
CMR: A=1/2^2+1/3^2+1/4^2+...+1/100^2<1
CMR : 1+1/2+1/3+1/4+....+1/2100-1<100
Cmr: S= 1+1/2^2+1/3^2+1/4^2+...+1/100^2>3/2
CMR(1/1*2+1/2*3+1/3*4+1/4*5+...+1/99*100):(1/51+1/52+1/53+...+1/100) = 1