Question

ai giúp mình làm bài này đc k ạ

Answer 1

-9/20

Answer 2

có bài làm ko ạ

 

Answer 3

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

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

\(\Leftrightarrow\dfrac{2}{3}x=\dfrac{5}{10}-\dfrac{8}{10}\)

\(\Leftrightarrow\dfrac{2}{3}x=-\dfrac{3}{10}\)

\(\Leftrightarrow x=-\dfrac{3}{10}:\dfrac{2}{3}\)

\(\Leftrightarrow x=-\dfrac{3}{10}.\dfrac{3}{2}\)

\(\Leftrightarrow x=-\dfrac{9}{20}\)

Answer 4

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

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

\(\dfrac{2}{3}x=-\dfrac{3}{10}\)

\(x=-\dfrac{3}{10}:\dfrac{2}{3}\)

\(x=-\dfrac{9}{20}\)

Answer 5

-9/20

Answer 6