a: \(\dfrac{-11}{81}=\dfrac{1}{27}\cdot\dfrac{-11}{3}\)

b: \(\dfrac{-11}{81}=\dfrac{1}{27}:\dfrac{3}{-11}\)

\(a) \frac{-11}{81}=\frac{11}{9}\times\frac{-1}{9}\)

\(b)\frac{-11}{81}=\frac{22}{243}\div\frac{-2}{3}\)

a: \(-\dfrac{7}{20}=\dfrac{-7}{5}\cdot\dfrac{1}{4}\)

b: \(-\dfrac{7}{20}=\dfrac{-7}{5}:\dfrac{4}{1}\)

Đây nè bạn, nhớ tick hộ mik ✔
a)\(\dfrac{1}{10}\cdot\dfrac{-7}{2}=\dfrac{-7}{20}\)

b)\(\dfrac{-7}{20}:1=\dfrac{-7}{20}\)

=))) 

a) \(-\dfrac{7}{20}=\dfrac{-7}{5}\cdot\dfrac{1}{4}\)

b) \(-\dfrac{7}{20}=\dfrac{-7}{5}:\dfrac{4}{1}\)

a) \(\dfrac{-7}{20}=\dfrac{1}{5}.\dfrac{-7}{4}\) b) \(\dfrac{-7}{20}=\dfrac{-7}{40}:\dfrac{1}{2}\) c) \(\dfrac{-7}{20}=\dfrac{2}{5}+\dfrac{-3}{4}\) d) \(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)

a)\(\dfrac{-7}{20}=\dfrac{-7}{10}\times\dfrac{1}{2}\)

b)\(\dfrac{-7}{20}=\dfrac{-7}{40}\times\dfrac{1}{2}\)

c)\(\dfrac{-7}{20}=\dfrac{7}{20}+\dfrac{-7}{10}\)

d)\(\dfrac{-7}{20}=\dfrac{-1}{5}+\dfrac{-3}{20}\)