Question

Giúp tớ nha

Answer 1

căn viết là v nhé

a) = 2v2v3- 4v2 + 1 + 4v2+8-2v6

= 2v6+ 9 - 2v6 =9

b) (v6 +v14)/ (v2v6 +v2v14) = 1/v2 = v2/2

Answer 2

A= \(2\sqrt{6}-4\sqrt{2}+1+4\sqrt{2}+8-2\sqrt{6}=9\)

B=\(\dfrac{\sqrt{6}+\sqrt{14}}{2\sqrt{3}+2\sqrt{7}}=\dfrac{\sqrt{2}\left(\sqrt{3}+\sqrt{7}\right)}{2\left(\sqrt{3}+\sqrt{7}\right)}=\dfrac{1}{\sqrt{2}}\)