Bạn tham khảo :
Bài $52$ :
$\dfrac{7}{5} : {4}{3} = \dfrac{7}{5} . \dfrac{3}{4}$
$1,7 : 0,85 =\dfrac{17}{10} : \dfrac{85}{100} = \dfrac{17}{10} . \dfrac{100}{85}$
$ \dfrac{1}{5} : 0,5 = \dfrac{1}{5} : \dfrac{5}{10} = \dfrac{1}{5} .\dfrac{10}{5}$
$0,02 : 1,3 =\dfrac{2}{100} : \dfrac{13}{10} = \dfrac{2}{100} . \dfrac{10}{13}$
Bài $54$ :
- Các tỉ lệ thức là :
$\dfrac{3}{9} = \dfrac{27}{81}$
$ \dfrac{27}{81} = \dfrac{3}{9}$
$\dfrac{9}{81} = \dfrac{3}{27}$
$\dfrac{81}{9} = \dfrac{27}{3}$
$\dfrac{81}{243} = \dfrac{9}{27}$
$\dfrac{243}{81} = \dfrac{27}{9}$
