Question

a, x+1/4=5/3   b, x*4/5=7/8   c, x;2/3=1/5  .

 

Answer 1

a) \(x+\dfrac{1}{4}=\dfrac{5}{3}\)

\(\Leftrightarrow x=\dfrac{5}{3}-\dfrac{1}{4}\)

\(\Leftrightarrow x=\dfrac{20}{12}-\dfrac{3}{12}\)

\(\Leftrightarrow x=\dfrac{17}{12}\)

b) \(x\times\dfrac{4}{5}=\dfrac{7}{8}\)

\(\Leftrightarrow x=\dfrac{7}{8}:\dfrac{4}{5}\)

\(\Leftrightarrow x=\dfrac{7}{8}\times\dfrac{5}{4}\)

\(\Leftrightarrow x=\dfrac{35}{32}\)

c) \(x:\dfrac{2}{3}=\dfrac{1}{5}\)

\(\Leftrightarrow x=\dfrac{1}{5}\times\dfrac{2}{3}\)

\(\Leftrightarrow x=\dfrac{2}{15}\)

Answer 2

) x + 1 4 = 5 3 ⇔ x = 5 3 − 1 4 ⇔ x = 20 12 − 3 12 ⇔ x = 17 12 b) x × 4 5 = 7 8