Question

3 - Tìm x :                     3/7: 7/x : 3/4 = 12/105

Answer 1

\(\dfrac{3}{7}:\dfrac{7}{x}:\dfrac{3}{4}=\dfrac{12}{105}\)

\(\dfrac{3}{7}.\dfrac{x}{7}=\dfrac{3}{35}\)

\(\dfrac{x}{7}=\dfrac{1}{5}\)

\(x=\dfrac{1}{5}.7=\dfrac{7}{5}\)

Answer 2

tìm x biết  :

\(\dfrac{3}{7}\) :  \(\dfrac{7}{x}\) : \(\dfrac{3}{4}\) = \(\dfrac{12}{105}\)

\(\dfrac{3}{7}\) : \(\dfrac{7}{x}\) = \(\dfrac{12}{105}\)\(\times\) \(\dfrac{3}{4}\)

\(\dfrac{3}{7}\) \(\times\) \(\dfrac{x}{7}\) = \(\dfrac{3}{35}\)

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

        \(\dfrac{x}{7}\) = \(\dfrac{1}{5}\)

         \(x\) =  \(\dfrac{1}{5}\) \(\times\) 7

         \(x\) = \(\dfrac{7}{5}\)