Question

giúp mình bài 4 đại với ạ

Answer 1

4:

a: \(=3\cdot2\sqrt{3}-4\cdot3\sqrt{3}+5\cdot4\sqrt{3}\)

\(=6\sqrt{3}-12\sqrt{3}+20\sqrt{3}=14\sqrt{3}\)

b: \(=2\sqrt{3}+5\sqrt{3}-3\sqrt{3}=4\sqrt{3}\)

c: \(=2\cdot3\sqrt{2}-7\sqrt{2}+9\sqrt{2}\)

\(=-\sqrt{2}+9\sqrt{2}=8\sqrt{2}\)

d: \(=5\cdot4\sqrt{3}-4\cdot3\sqrt{3}-2\cdot5\sqrt{3}+6\sqrt{3}\)

\(=20\sqrt{3}-12\sqrt{3}-10\sqrt{3}+6\sqrt{3}=4\sqrt{3}\)