Question

tìm số tự nhiên x biết:

2x . (x-3)-x+3=0

Answer 1

2x(x-3) - x + 3 = 0

 

=>2x(x-3)-(x-3)=0

 

=>(x-3)(2x-1)=0

 

=>x-3 =0 hoặc 2x-1=0

 

=>x=3 hoặc x=

 

vậy S={3;}

Answer 2

`!`

`2x(x-3)-x+3=0`

`=> 2x(x-3)-(x-3)=0`

`=>(x-3)(2x-1)=0`

\(\Rightarrow\left[{}\begin{matrix}x-3=0\\2x-1=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{1}{2}\end{matrix}\right.\)