Question

                        

Answer 1

mình cần câu trả lời gấp

 

Answer 2

\(\left[\left(6\dfrac{3}{5}-3\dfrac{3}{14}\right)\cdot2,5\right]:\left(21-1,25\right)=x:5\dfrac{5}{6}\\ \Leftrightarrow\dfrac{237}{70}\cdot\dfrac{5}{2}:\dfrac{79}{4}=x:\dfrac{35}{6}\\ \Leftrightarrow x:\dfrac{35}{6}=\dfrac{3}{7}\\ \Leftrightarrow x=\dfrac{3}{7}\cdot\dfrac{35}{6}=\dfrac{5}{2}\)

Answer 3

\(\left[\left(6\dfrac{3}{5}-3\dfrac{3}{14}\right)\cdot\dfrac{5}{2}\right]:\left(21-1.25\right)=x:5\dfrac{5}{6}\)

\(\Leftrightarrow x:\dfrac{35}{6}=\dfrac{3}{7}\)

hay \(x=\dfrac{5}{2}\)