giải giúp mik bài này đi mn (hỗn số)
4 1/5 x 2 1/4 = ..../.... x ..../.... = .........................................................................
4 1/5 : 2 1/4 = ....................................................................................................
3 3/5 x 1 2/3 = ...................................................................................................
3 3/5 : 1 2/3 = ....................................................................................................
\(4\dfrac{1}{5}\)x\(2\dfrac{1}{4}=\)\(\dfrac{21}{5}\)x\(\dfrac{9}{4}\)\(=\dfrac{189}{20}\)
\(4\dfrac{1}{5}:2\dfrac{1}{4}=\dfrac{21}{5}:\dfrac{9}{4}=\dfrac{21}{5}\)x\(\dfrac{4}{9}\)=\(\dfrac{84}{45}=\dfrac{28}{15}\)
\(3\dfrac{3}{5}\)x\(1\dfrac{2}{3}=\)\(\dfrac{18}{5}\)x\(\dfrac{5}{3}=\)\(\dfrac{90}{15}=6\)
\(3\dfrac{3}{5}:1\dfrac{2}{3}=\dfrac{18}{5}:\dfrac{5}{3}=\dfrac{18}{5}\)x\(\dfrac{3}{5}=\)\(\dfrac{54}{25}\)
