a )
\(\frac{-1}{5}.\frac{1}{2}=\frac{\left(-1.1\right)}{5.2}=\frac{-1}{10}\)
b )
\(\frac{-1}{8}.\frac{8}{9}=\frac{-1.1}{1.9}=\frac{-1}{9}\)
c )
\(\frac{-3}{7}.\frac{14}{15}=\frac{-1.2}{1.3}=\frac{-2}{3}\)
e )
\(\left(-4\right).\frac{7}{24}=\frac{-28}{24}=\frac{-7}{6}\)
f )
\(\frac{-9}{13}.\frac{-5}{18}=\frac{\left(-1\right).\left(-5\right)}{13.2}=\frac{6}{26}=\frac{3}{13}\)
đúng đó , tk mk nhé ! hihiii
a,\(\frac{-1}{10}\) b,\(\frac{-1}{9}\) c,\(\frac{-2}{5}\) e,\(\frac{-7}{6}\) f,\(\frac{-5}{26}\)