Question

phân tích thành nhân tử

 

Answer 1

14) \(\sqrt{7-4\sqrt{3}}\)

\(=\sqrt{2^2-2\cdot2\cdot\sqrt{3}+\left(\sqrt{3}\right)^2}\)

\(=\sqrt{\left(2-\sqrt{3}\right)^2}\)

\(=\left(\sqrt{2-\sqrt{3}}\right)\cdot\left(\sqrt{2-\sqrt{3}}\right)\)