Question

Tìm x

a/\(\dfrac{x}{5}\)+\(\dfrac{1}{2}\)=\(\dfrac{6}{10}\)

b/\(\dfrac{1}{2}\).\(x\)+\(\dfrac{1}{2}\)=\(\dfrac{5}{2}\)

c/\(\dfrac{1}{2}\)-\(\dfrac{2}{3}\).\(x\)=\(\dfrac{7}{12}\)

giúp e ạ

Answer 1

\(\dfrac{x}{5}+\dfrac{1}{2}=\dfrac{6}{10}\Leftrightarrow\dfrac{x}{5}=\dfrac{6}{10}-\dfrac{1}{2}\Rightarrow x=\dfrac{1}{10}\)

Answer 2

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

Answer 3

\(\dfrac{1}{2}-\dfrac{2}{3}.x=\dfrac{7}{12}\Leftrightarrow\dfrac{2}{3}.x=\dfrac{1}{2}+\dfrac{7}{12}\Leftrightarrow\dfrac{2}{3}.x=\dfrac{13}{12}\Leftrightarrow x=\dfrac{13}{12}:\dfrac{2}{3}\Leftrightarrow x=\dfrac{13}{8}\)

Answer 4

Giải:

a)x/5+1/2=6/10

   x/5+1/2=3/5

          x/5=3/5-1/2

          x/5=1/10

=>x.2/10=1/10

=>x.2=1

       x=1:2

       x=1/2

b)1/2.x+1/2=5/2

1/2.x+1/2.1=5/2

    1/2.(x+1)=5/2

             x+1=5/2:1/2

             x+1=5

                 x=5-1

                 x=4

c)1/2-2/3.x=7/12

         2/3.x=1/2-7/12

         2/3.x=-1/12

               x=-1/12:2/3

               x=-1/8

Chúc e học tốt!

Answer 5

a) Ta có: \(\dfrac{x}{5}+\dfrac{1}{2}=\dfrac{6}{10}\)

\(\Leftrightarrow\dfrac{x}{5}=\dfrac{6}{10}-\dfrac{1}{2}=\dfrac{1}{10}\)

hay \(x=\dfrac{1}{2}\)

Vậy: \(x=\dfrac{1}{2}\)