Question

(1) tính

a) \(\sqrt{3}+2\sqrt{12}+4\sqrt{75}-\sqrt{300}\)

b) \(2\sqrt{20}+\sqrt{\left(1-\sqrt{5}\right)^2}-\dfrac{20}{\sqrt{5}+1}\)

c) \(\dfrac{6}{\sqrt{13}-1}+\dfrac{6}{\sqrt{13}+1}\)

d) \(\sin^238^0+\cot23^0+\sin^252^0-\tan67^0\)

giúp mk vs ạ mai mk hc rồi

Answer 1

a: \(=\sqrt{3}+4\sqrt{3}+4\cdot5\sqrt{3}-10\sqrt{3}\)

\(=15\sqrt{3}\)

b: \(=2\cdot2\sqrt{5}+\sqrt{5}-1-5+5\sqrt{5}\)

=-6