Question

\(\frac{x}{300}-\frac{\left(x+600\right)}{400}=1\)

Answer 1

Ta có : \(\frac{x}{300}-\frac{\left(x+600\right)}{400}=1\)

\(\Rightarrow\)   \(\frac{x}{300}-\left(\frac{x}{400}+\frac{600}{400}\right)=1\)

\(\Rightarrow\)    \(\frac{x}{300}-\frac{x}{400}-\frac{3}{2}=1\)

\(\Rightarrow\)    \(\frac{x}{300}-\frac{x}{400}=\frac{5}{2}\)

\(\Rightarrow\)     \(x.\left(\frac{1}{300}-\frac{1}{400}\right)=\frac{5}{2}\)

\(\Rightarrow\)     \(x.\frac{1}{1200}=\frac{5}{2}\)

\(\Rightarrow\)     \(x=\frac{5}{2}:\frac{1}{1200}\)

\(\Rightarrow\)     \(x=3000\)

Vậy \(x=3000\)

             Cbhg ♡