Question

Answer 1

=>3/5(x-2)=1/5-1/2=-3/10

=>x-2=-1/2

hay x=3/2

Answer 2

\(\dfrac{1}{2}+\dfrac{3}{5}\cdot\left(x-2\right)=20\%\)

\(\dfrac{1}{2}+\dfrac{3}{5}\cdot\left(x-2\right)=\dfrac{1}{5}\)

\(\dfrac{3}{5}\cdot\left(x-2\right)=\dfrac{1}{5}-\dfrac{1}{2}\)

\(\dfrac{3}{5}\cdot\left(x-2\right)=-\dfrac{3}{10}\)

\(x-2=\left(-\dfrac{3}{10}\right):\dfrac{3}{5}\)

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

\(x=\left(-\dfrac{1}{2}\right)+2\)

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

Answer 3

`1/2 + 3/5( x-2 ) = 20%`

`=> 1/2 + 3/5x - 6/5 - 20% = 0`

`=> ( 1/2 - 6/5 - 1/5 ) + 3/5x = 0`

`=> 3/5x -9/10=0`

`=> 6/10x = 9/10`

`=> 6x=9`

`=> x = 9/6 = 3/2`

Vậy `..`