23 dm = 23/10 m
41 mm = 41/1000 m
-4/5 > 5/-6
\(a)23dm=2,3m\)
\(41mm=0,041m\)
\(b)\frac{-4}{5}=\frac{-4.6}{5.6}=-\frac{24}{30}\)
\(\frac{5}{-6}=\frac{5.-5}{-6.-6}=-\frac{25}{30}\)
\(Do\) \(-\frac{24}{30}>-\frac{25}{30}\Rightarrow\frac{-4}{5}>\frac{5}{-6}\)
Chúc bạn học tốt !!!