Question

cum se face un exercitiu de genu V4-v7

V=radical mare
v=radical mic

Answer 1

$\it \sqrt{4-\sqrt7}$

[tex]\it \sqrt{4-\sqrt7} =\sqrt{\dfrac{7}{2}+\dfrac{1}{2} -\sqrt7} =\sqrt{\left(\sqrt{\dfrac{7}{2}}\right)^2 -\sqrt7 + \left(\sqrt{\dfrac{1}{2}}\right)^2} = \\\;\\ \sqrt{\left(\sqrt{\dfrac{\it7}{2}} - \sqrt{\dfrac{\it1}{2}}\right)^2} = \sqrt{\dfrac{\it7}{\it2}} - \sqrt{\dfrac{\it1}{\it2}}\right [/tex]