tính:
a) \(2\sqrt{3}+\sqrt{\left(2-\sqrt{3}\right)^2}\)
b) \(\dfrac{5+\sqrt{5}}{5-\sqrt{5}}+\dfrac{5-\sqrt{5}}{5+\sqrt{5}}\)
c) \(\left(\sqrt{28}-\sqrt{12}-\sqrt{7}\right)\sqrt{7}+2\sqrt{21}\)
d) \(\sqrt{17-3\sqrt{32}}+\sqrt{17+3\sqrt{32}}\)
e) \(\left(2+\sqrt{5}+\sqrt{3}\right)\left(2+\sqrt{5}-\sqrt{3}\right)\)
f) \(\left(\sqrt{\dfrac{1}{3}-\sqrt{\dfrac{4}{3}}+\sqrt{3}}\right):3\)
Giúp mình với:(
a: \(=2\sqrt{3}+2-\sqrt{3}=2+\sqrt{3}\)
b: \(=\dfrac{\sqrt{5}+1}{\sqrt{5}-1}+\dfrac{\sqrt{5}-1}{\sqrt{5}+1}\)
\(=\dfrac{6+2\sqrt{5}+6-2\sqrt{5}}{4}=\dfrac{12}{4}=3\)
c: \(=\left(\sqrt{7}-2\sqrt{3}\right)\cdot\sqrt{7}+2\sqrt{21}\)
=7
d: \(=\sqrt{17-12\sqrt{2}}+\sqrt{17+12\sqrt{2}}\)
\(=3-2\sqrt{2}+3+2\sqrt{2}\)
=6