Question

(x-1/2)^2

Answer 1

Triển khai hả em?

Answer 2

`(x-1/2)^2`

`=x^2-2*x*1/2+(1/2)^2`

`=x^2-x+1/4`

Hằng đẳng thức:`(a-b)^2=a^2-2ab+b^2`

Answer 3

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

⇔  \(x^2-2.x.\dfrac{1}{2}+\left(\dfrac{1}{2}\right)^2\)

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