x2 – x + \(\frac...

Câu hỏi: x² – x + \(\frac{1}{4}\) bằng:

A. \({\left( {x +\frac{1}{2}} \right)^2}\)

B. \({\left( {x - \frac{1}{2}} \right)^2}\)

C. \({\left( {x +\frac{1}{8}} \right)^2}\)

D. \({\left( {x +\frac{1}{4}} \right)^2}\)