So sanh A va B biet A=2010/2011+2011/2012+2012/2010 va B=1/3+1/4+1/5+....+1/17
so sanh A va B bit
A=\(\frac{1}{3}+\frac{1}{4}+...+\frac{1}{17}\)
B=\(\frac{2010}{2011}+\frac{2011}{2012}+\frac{2012}{2010}\)
A=2010^2011+1/2010^2012+1
B=2010^2010+1/2010^2011+1
SO SANH A VA B
A = 20102011+1/ 20102012+1 < 20102011+1 + 2009 / 20102012+1+2009
= 20102011+2010/20102012+2010
=2010(2010^2010+1) / 2010(2010^2011+1)
= 2010^2010 + 1 / 2010^ 2011 +1 = B
=> A < B
Như vậy mới đúng nè
Ta có B=2010^2010 + 1/ 2010^2011 + 1 < 2010^2010+1+9/2010^2011+1+9=2010^2011+1/2010^2012+1
Vậy B<A
A=2010^2011+1/2010^2012+1B=2010^2010+1/2010^2011+1SO SANH A VA B.
Ta có:
\(A=\dfrac{2010^{2011}+1}{2010^{2012}+1}\)
\(A< \dfrac{2010^{2011}+1+2009}{2010^{2012}+1+2009}\)
\(A< \dfrac{2010^{2011}+2010}{2010^{2012}+2010}\)
\(A< \dfrac{2010\left(2010^{2010}+1\right)}{2010\left(2010^{2011}+1\right)}\)
\(A< \dfrac{2010^{2010}+1}{2010^{2011}+1}\)
Mà \(B=\dfrac{2010^{2010}+1}{2010^{2011}+1}\)
\(\Rightarrow A< B\)
So sanh:
A = 20102011+1 phan 20102012+1 va B =20102010+1 phan 20102011+1
\(A=\frac{2010^{2011}+1+2009}{2010^{2012}+1+2009}=\frac{2010^{2011}+2010}{2010^{2012}+2010}=\frac{2010\left(2010^{2010}+1\right)}{2010\left(2010^{2011}+1\right)}\)\(=B\)
so sanh p va q biet
p=2010/2011+2011/2012+2012/2013
q=2010+2011+2012/2011+2012+2013
ta có:Q=2010+2011+2012/2011+2012+2013=2010/2011+2012+2013+2011/2011+2012+2013+2012/2011+2012+2013
=> P>2010/2011+2012+2013
P>2011/2011+2012+2013
P>2012/2011+2012+2013
=>P>Q
So sánh A và B,biết: A = 2010/2011 + 2011/2012 + 2012/2010 và B =1/3 + 1/4 + 1/5 + ...+ 1/17.
So sánh A và B biết A = 2010/2011+2011/2012+2012/2010 và B = 1/3+1/4+1/5+...+1/17
So sánh A và B biết A= 2010/2011 + 2011/2012 + 2012/2010; B=1/3+1/4+1/5+....+1/17
So sánh A và B biết A= 2010/2011 + 2011/2012 + 2012/2010; B=1/3+1/4+1/5+....+1/17