Question

Help me!

Answer 1

Bài 3: 

a: Ta có: \(A=3\sqrt{3}+5\sqrt{12}-2\sqrt{27}\)

\(=3\sqrt{3}+10\sqrt{3}-6\sqrt{3}\)

\(=7\sqrt{3}\)

b: ta có: \(B=\left(\sqrt{20}-\sqrt{45}+3\sqrt{5}\right):\sqrt{5}\)

\(=\left(2\sqrt{5}-3\sqrt{5}+3\sqrt{5}\right):\sqrt{5}\)

=2

c: ta có: \(C=\sqrt{5-\sqrt{13+\sqrt{48}}}\)

\(=\sqrt{5-2\sqrt{3}-1}\)

\(=\sqrt{3}-1\)