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a, Ta có: \(\frac{-4}{9}=\frac{-8}{18}>\frac{-8}{13}\Rightarrow\frac{-4}{9}>\frac{-8}{13}\)
b,Ta có: \(\frac{-2005}{2006}>-1\)
\(\frac{-2007}{2004}=-1-\frac{3}{2004}<-1\)
\(\Rightarrow-\frac{2005}{2006}>-1>-\frac{2007}{2004}\)
Vậy -2005/2006>-2007/2004
A; so sánh \(\frac{13^{15}+1}{13^{16}+1}\); \(\frac{13^{16}+1}{13^{17}+1}\)
\(\frac{13^{16}+1}{13^{17}+1}\) < \(\frac{13^6+\left(1+12\right)}{13^7+\left(1+12\right)}\) = \(\frac{13^{16}+13}{13^{17}+13}\) = \(\frac{13^{}.\left(13^{15}+1\right)}{13^{}.\left(13^{16}+1\right)}\)= \(\frac{13^{15}+1}{13^{16}+1}\)
Vậy \(\frac{13^{15}+1}{13^{16}+1}\)> \(\frac{13^{16}+1}{13^{17}+1}\)
Câu B:
\(\frac{1999^{2000}+1}{1999^{1999}+1}\) > \(\frac{1999^{2000}+\left(1+1998\right)}{1999^{1999}+\left(1+1998\right)}\) = \(\frac{1999^{2000}+1999}{1999^{1999}+1999}\) = \(\frac{1999.\left(1999^{1999}+1\right)}{1999.\left(1999^{1998}+1\right)}\)
\(\frac{1999.\left(1999^{1999}+1\right)}{1999.\left(1999^{1998}+1\right)}\) = \(\frac{1999^{1999}+1}{1999^{1998}+1}\)
Vậy
\(\frac{1999^{1999}+1}{1999^{1998}+1}\) < \(\frac{1999^{2000}+1}{1999^{1999}+1}\)
Có cách chậm nhất à , ko có cách nhanh nhất
\(BCNN\left(38;88\right)\) = 1672
\(-\dfrac{13}{38}=-\dfrac{572}{1672}\)
\(-\dfrac{29}{88}=-\dfrac{551}{1672}\)
Ta có : \(-\dfrac{572}{1672}< -\dfrac{551}{1672}\)
\(\Rightarrow-\dfrac{13}{38}< -\dfrac{29}{88}\)
1.a=2009^2009(2009+1)
=2009^2009x2010. tự cm nốt
e tách số mũ ra nhé
a^m>a^n(m>n>0)
a) 3/4 < 1
115/14 > 1
=> 3/4 < 115/14
b) 2000/1999 > 1
1998/1999 < 1
=> 2000/1999>1998/1999
c)-17/234 < 0 , 1/1995 > 0
=> -17/234 < 1/1995
d) 23/-15 < 0 ; -17/-49>0
=> 23/-15 < -17/-49