Question

X x 50% + 3/2  x X =0,8

Answer 1

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

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

\(x.2=\)\(\dfrac{4}{5}\)

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

\(x=\)\(\dfrac{4}{10}=\dfrac{2}{5}\)

vậy \(x =\)\(\dfrac{2}{5}\) 

Answer 2

\(x\times50\%+\dfrac{3}{2}\times x=0,8\)

\(\Leftrightarrow x\times\dfrac{50}{100}+\dfrac{3}{2}\times x=0,8\)

\(\Leftrightarrow x\times\dfrac{1}{2}+\dfrac{3}{2}\times x=\dfrac{4}{5}\)

\(\Leftrightarrow x\left(\dfrac{1}{2}+\dfrac{3}{2}\right)=\dfrac{4}{5}\)

\(\Leftrightarrow x\times2=\dfrac{4}{5}\)

\(\Leftrightarrow x=\dfrac{4}{5}:2\)

\(\Leftrightarrow x=\dfrac{4}{5}\times\dfrac{1}{2}\)

\(\Leftrightarrow x=\dfrac{2}{5}\)

Answer 3

\(=>x.\left(50\%+\dfrac{3}{2}\right)=0,8\)

\(=>x.\left(\dfrac{1}{2}+\dfrac{3}{2}\right)=\dfrac{4}{5}\)

\(=>2x=\dfrac{4}{5}\)

\(x=\dfrac{4}{5}\times\dfrac{1}{2}=\dfrac{4}{10}=\dfrac{2}{5}\)