Question

Giúp vs ạ em đang cần gấp hôm nay

Answer 1

1: \(\sqrt{20}-2\sqrt{45}+3\sqrt{80}-\sqrt{320}\)

\(=2\sqrt{5}-6\sqrt{5}+12\sqrt{5}-8\sqrt{5}\)

\(=0\)

6: \(\sqrt{6+2\sqrt{5}}+\sqrt{6-2\sqrt{5}}\)

\(=\sqrt{5}+1+\sqrt{5}-1\)

\(=2\sqrt{5}\)