Các bạn giúp mk với, còn nốt mấy câu so sánh này nữa thôi, ai nhanh mk k cho
a)
\(\frac{-17}{243}< 0\)
\(\frac{1}{1965}>0\)
\(\frac{-17}{243}< \frac{1}{1965}\)
b,
\(\frac{23}{-15}< 0\)
\(\frac{-17}{-49}>0\)
\(\frac{23}{-15}< \frac{-17}{-49}\)
c,
\(\frac{-2004}{2005}=-1+\frac{1}{2005}\)
\(\frac{-2005}{2006}=-1+\frac{1}{2006}\)
Vì \(\frac{1}{2005}>\frac{1}{2006}\)
Nên \(-1+\frac{1}{2005}>-1+\frac{1}{2006}\)
Vậy \(\frac{-2004}{2005}>\frac{-2005}{2006}\)
a) Ta có : \(\frac{-17}{243}< 0< \frac{1}{1965}\)
\(\Rightarrow\frac{-17}{243}< \frac{1}{1965}\)
b) Ta có : \(\frac{-17}{-49}=\frac{17}{49}\)
\(\Rightarrow\frac{23}{-15}< 0< \frac{17}{49}\)
\(\Rightarrow\frac{23}{-15}< \frac{17}{49}\)
\(\Rightarrow\frac{23}{-15}< \frac{-17}{-49}\)
c) Ta có : \(\frac{2004}{2005}=\frac{2005}{2005}-\frac{1}{2005}=1-\frac{1}{2005}\)
\(\frac{2005}{2006}=\frac{2006}{2006}-\frac{1}{2006}=1-\frac{1}{2006}\)
mà \(\frac{1}{2005}>\frac{1}{2006}\)
\(\Rightarrow1-\frac{1}{2005}< 1-\frac{1}{2006}\)
\(\Rightarrow\frac{2004}{2005}< \frac{2005}{2006}\)
\(\Rightarrow\frac{-2004}{2005}>\frac{-2005}{2006}\)