\(A=\frac{17^{2008}+1}{17^{2009}+1}\) và \(B=\frac{17^{2009}+1}{17^{2010}+1}\)
So sánh
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Ta có :
\(17A=\frac{17^{2009}+17}{17^{2009}+1}=\frac{17^{1009}+1+16}{17^{2009}+1}=\frac{17^{2009}+1}{17^{2009}+1}+\frac{16}{17^{2009}+1}=1+\frac{16}{17^{2009}+1}\)
\(17B=\frac{17^{2010}+17}{17^{2010}+1}=\frac{17^{2010}+1+16}{17^{2010}+1}=\frac{17^{2010}+1}{17^{2010}+1}+\frac{16}{17^{2010}+1}=1+\frac{16}{17^{2010}+1}\)
Vì \(\frac{16}{17^{2009}+1}>\frac{16}{17^{2010}+1}\) nên \(17A>17B\)
\(\Rightarrow\)\(A>B\)
Vậy \(A>B\)
Chúc bạn học tốt ~
17A = \(\frac{17^{2009}+17}{17^{2009}+1}=1+\frac{16}{17^{2009}+1}\)
17B = \(\frac{17^{2010}+17}{17^{2010}+1}=1+\frac{16}{17^{2010}+1}\)
mà \(\frac{16}{17^{2009}+1}>\frac{16}{17^{2010}+1}\)
=> A > B
B < 17 ^ 2009 + 1 + 16 / 17^2010 + 1+16 = 17^2009 + 17 / 17^2010 + 17 = 17(17^2008 + 1) / 17(17^2009+1) = 17^2008 + 1 / 17^2009 + 1 =A
=> B < A
****** k mk nha!
cu lay phep tinh nay tru phep tinh kia hk ra thi nt hoi mink
B = 20092009 + 1 / 20092010+1 < 20092009+1+2008 / 20092010+1+2008
= 20092009+2009 / 20092010+2009
= 2009(20092008+1) / 2009(20092009+1)
= 20092008+1 / 20092009+1 = A
=> A > B nhé!
Ai k mk mk k lại !!
Ta có: \(B=\frac{2009^{2009}+1}{2009^{2010}+1}<\frac{2009^{2009}+1+2008}{2009^{2010}+1+2008}\)
\(=\frac{2009^{2009}+2009}{2009^{2010}+2009}\)
\(=\frac{2009.\left(2009^{2008}+1\right)}{2009.\left(2009^{2009}+1\right)}\)
\(=\frac{2009^{2008}+1}{2009^{2009}+1}=A\)
=> B<A
Ai k mik mik k lại. Chúc các bạn thi tốt
Ta có: $B=\frac{2009^{2009}+1}{2009^{2010}+1}<\frac{2009^{2009}+1+2008}{2009^{2010}+1+2008}$B=20092009+120092010+1 <20092009+1+200820092010+1+2008
$=\frac{2009^{2009}+2009}{2009^{2010}+2009}$=20092009+200920092010+2009
$=\frac{2009.\left(2009^{2008}+1\right)}{2009.\left(2009^{2009}+1\right)}$=2009.(20092008+1)2009.(20092009+1)
$=\frac{2009^{2008}+1}{2009^{2009}+1}=A$=20092008+120092009+1 =A
=> B<A
Ai k mik mik k lại. Chúc các bạn thi tốt
Ta có: B=\(\frac{17^{2009}+1}{17^{2010}+1}\)<1 ( Vì 172009+1< 172010+1 )
Nên B=\(\frac{17^{2009}+1}{17^{2010}+1}\)<\(\frac{17^{2009}+1+16}{17^{2010}+1+16}\)
=\(\frac{17^{2009}+17}{17^{2010}+17}\)
=\(\frac{17\left(17^{2008}+1\right)}{17\left(17^{2009}+1\right)}\)
=\(\frac{17^{2008+1}}{17^{2009}+1}\)=A
Vậy A>B