Question

Answer 1

P/s Nhớ tick cho mình nha. Thanks bạn

Answer 2

\(\Leftrightarrow\dfrac{x}{3}+\dfrac{4}{3}+\dfrac{x}{4}-\dfrac{5}{4}=x+\dfrac{7}{5}\)

\(\Leftrightarrow\dfrac{7x}{12}+\dfrac{1}{12}=x+\dfrac{7}{5}\)

\(\Leftrightarrow\dfrac{5x}{12}=\dfrac{79}{60}\)

\(\Leftrightarrow x=\dfrac{79}{5}\)

Answer 3

    \(\dfrac{x+4}{3}+\dfrac{x-5}{4}=\dfrac{5x+7}{5}\)

\(\Rightarrow\) \(\dfrac{x}{3}+\dfrac{4}{3}+\dfrac{x}{4}-\dfrac{5}{4}=\dfrac{5x}{5}+\dfrac{7}{5}\)

\(\Rightarrow\) \(\dfrac{7x}{12}+\dfrac{1}{12}=x+7\)

\(\Rightarrow\) \(\dfrac{-5x}{12}=\dfrac{13}{2}\)

\(\Rightarrow\) \(-10x=13.12=156\)

\(\Rightarrow\) \(x=-\dfrac{78}{5}\)