b) \(B\)
Bài 3 :
\(x\times\dfrac{4}{5}=\dfrac{5}{9}\)
\(x=\dfrac{5}{9}:\dfrac{4}{5}\)
\(x=\dfrac{5}{9}\times\dfrac{5}{4}\)
\(x=\dfrac{25}{36}\)
b) \(x:\dfrac{3}{4}=\dfrac{8}{11}\)
\(x=\dfrac{8}{11}\times\dfrac{3}{4}\)
\(x=\dfrac{24}{44}\)
\(x=\dfrac{6}{11}\)
c) \(\dfrac{5}{6}:x=\dfrac{2}{3}\)
\(x=\dfrac{5}{6}:\dfrac{2}{3}\)
\(x=\dfrac{5}{6}\times\dfrac{3}{2}\)
\(x=\dfrac{15}{12}\)
\(x=\dfrac{5}{4}\)
b) B
bài 2 :
a)\(=>x=\dfrac{5}{9}:\dfrac{4}{5}=\dfrac{5}{9}\times\dfrac{5}{4}=\dfrac{25}{36}\)
b)\(=>x=\dfrac{8}{11}\times\dfrac{3}{4}=\dfrac{24}{44}=\dfrac{6}{11}\)
c)\(=>x=\dfrac{5}{6}:\dfrac{2}{3}=\dfrac{5}{6}\times\dfrac{3}{2}=\dfrac{15}{12}=\dfrac{5}{4}\)
