Question

a)2x.(x-\(\dfrac{1}{7}\) ) =0

b) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)

c) \(4\dfrac{5}{9}:2\dfrac{5}{18}-7< x< \left(3\dfrac{1}{5}:3,2+4,5.1\dfrac{31}{45}\right)\)

Answer 1

b) \(\dfrac{3}{4}+\dfrac{1}{4}:x=\dfrac{2}{5}\)

\(\Rightarrow\dfrac{1}{4}:x=\dfrac{2}{5}-\dfrac{2}{4}\)

\(\Rightarrow\dfrac{1}{4}:x=-\dfrac{1}{10}\)

\(\Rightarrow x=\dfrac{1}{4}:\left(-\dfrac{1}{10}\right)\)

\(\Rightarrow x=-\dfrac{3}{2}\)