Question

a/ \(\dfrac{-3}{5}\) - x = \(\dfrac{21}{10}\)

b/ x : \(\dfrac{2}{9}\) = \(\dfrac{9}{2}\)

c/ \(\dfrac{x}{9}\) = \(\dfrac{5}{3}\)

d/ x : \(\left(\dfrac{2}{5}\right)^3\)= \(\left(\dfrac{5}{2}\right)^3\)

Answer 1

\(\text{a)}\dfrac{-3}{5}-x=\dfrac{21}{10}\)

             \(x=\dfrac{-3}{5}-\dfrac{21}{10}=\dfrac{-27}{10}\)

\(\text{b)}x:\dfrac{2}{9}=\dfrac{9}{2}\)

   \(x\)        \(=\dfrac{9}{2}.\dfrac{2}{9}=1\)

\(\text{c) }\dfrac{x}{9}=\dfrac{5}{3}\)

\(\Rightarrow x=\dfrac{9.5}{3}=15\)

\(\text{d)}x:\left(\dfrac{2}{5}\right)^3=\left(\dfrac{5}{2}\right)^3\)

   \(x:\dfrac{8}{125}=\dfrac{125}{8}\)

   \(x\)           \(=\dfrac{125}{8}.\dfrac{8}{125}=1\)