Question

 a,                              b,25%.x+x= -1,25

ai giúp tui với

Answer 1

 

\(\dfrac{1}{2}x=\dfrac{5}{8}-\dfrac{3}{4}\)

\(\dfrac{1}{2}x=-\dfrac{1}{8}\)

x=-1/8:1/2

x=-1/4

 

Answer 2

\(\dfrac{3}{4}+\dfrac{1}{2}x=\dfrac{5}{8}\)

\(\Leftrightarrow\dfrac{6}{8}+\dfrac{4x}{8}=\dfrac{5}{8}\)

\(\Leftrightarrow\dfrac{4x}{8}=\dfrac{5}{8}-\dfrac{6}{8}\)

\(\Leftrightarrow\dfrac{4x}{8}=-\dfrac{1}{8}\)

\(25\%\cdot x+x=-1.25\)

\(\Leftrightarrow0.25\cdot x+x=-1.25\)

\(\Leftrightarrow1.25x=-1.25\)

\(\Leftrightarrow x=-1\)

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

Answer 3

Giải:

a) \(\dfrac{3}{4}+\dfrac{1}{2}x=\dfrac{5}{8}\) 

           \(\dfrac{1}{2}x=\dfrac{5}{8}-\dfrac{3}{4}\) 

           \(\dfrac{1}{2}x=\dfrac{-1}{8}\) 

              \(x=\dfrac{-1}{8}:\dfrac{1}{2}\) 

             \(x=\dfrac{-1}{4}\) 

b) \(25\%x+x=-1,25\) 

\(x.\left(25\%+1\right)=-1,25\) 

         \(x.1,25=-1,25\) 

                 \(x=-1,25:1,25\) 

                 \(x=1\)

Answer 4

a) \(\dfrac{3}{4}+\dfrac{1}{2}x=\dfrac{5}{8}\)

\(\dfrac{1}{2}x=\dfrac{5}{8}-\dfrac{3}{4}\)

\(\dfrac{1}{2}x=\dfrac{5}{8}-\dfrac{6}{8}\)

\(\dfrac{1}{2}x=\dfrac{-1}{8}\)

\(x=\dfrac{-1}{8}:\dfrac{1}{2}\)

\(x=\dfrac{-1}{8}.2\)

\(x=\dfrac{-1}{4}\)