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\(A=\left(2010^{2009}+2009^{2009}\right)^{2010}\)
\(=\left(2010^{2009}+2009^{2009}\right)^{2009}\left(2010^{2009}+2009^{2009}\right)\)
\(>\left(2010^{2009}+2009^{2009}\right)^{2009}.2010^{2009}\)
\(=\left(2010.2010^{2009}+2010.2009^{2009}\right)^{2009}\)
\(>\left(2010.2010^{2009}+2009.2009^{2009}\right)^{2009}\)
\(=\left(2010^{2010}+2009^{2010}\right)^{2009}=B\)
Vậy \(A>B\)
Dạo này anh ít on lắm em có nhờ thì em kiếm kênh khác nhờ không thì phải đợi a on a mới làm được nhé
Do 20092010-2<20092011-2=>B<1
Theo đề bài ta có:
\(B=\frac{2009^{2010}-2}{2009^{2011}-2}<\frac{2009^{2010}-2+2011}{2009^{2011}-2+2011}=\frac{2009^{2010}+2009}{2009^{2011}+2009}\)\(=\frac{2009\left(1+2009^{2009}\right)}{2009\left(1+2009^{2010}\right)}\)
\(=\frac{2009^{2009}+1}{2009^{2010}+1}\)\(=A\)=>B<A
Lời giải:
$2009A=\frac{2009^{2010}+2009}{2009^{2010}+1}=1+\frac{2008}{2009^{2010}+1}>1$
$2009B=\frac{2009^{2011}-4018}{2009^{2011}-2}=1-\frac{4016}{2009^{2011}-2}<1$
$\Rightarrow 2009A> 1> 2009B$
$\Rightarrow A> B$
Đặt \(a=2010^{2009};b=2009^{2009}\)\(\left(a,b>0\right)\)
\(A=\left(a+b\right)^{2010}=\left(a+b\right)^{2009}.\left(a+b\right)\)
\(B=\left(a.2010+b.2009\right)^{2009}=\left[a+2009\left(a+b\right)\right]^{2009}\)
Chia A và B cho \(\left(a+b\right)^{2009}:\)
\(A=a+b;B=\dfrac{\left[a+2009\left(a+b\right)\right]^{2009}}{\left(a+b\right)^{2009}}\)\(=\left(\dfrac{a}{a+b}+2009\right)^{2009}\)
Dễ thấy A<B.
\(B=\left(2010^{2009}.2010+2009^{2009}.2009\right)^{2009}\)
\(B< \left(2010^{2009}.2010+2009^{2009}.2010\right)^{2009}\)
\(B< \left(2010^{2009}+2009^{2009}\right)^{2009}.2010^{2009}\)
\(B< \left(2010^{2009}+2009^{2009}\right)^{2009}.\left(2010^{2009}+2009^{2009}\right)\)
\(B< \left(2010^{2009}+2009^{2009}\right)^{2010}\)
\(\Rightarrow B< A\)