\(\frac{1}{\sqrt{n}+\sqrt{n+1}}=\frac{\sqrt{n+1}-\sqrt{n}}{n+1-n}=\sqrt{n+1}-\sqrt{n}\)

\(\rightarrow\)VT = \(\sqrt{2}-\sqrt{1}+\sqrt{3}-\sqrt{2}+...+\sqrt{80}-\sqrt{79}=\sqrt{80}-1>4\)

NNS à :v

Học sinh ùa ra ra như đàn ong vỡ tổ.

consciousness -> conscious

1.famous

2.colorful

3.musicians

4.differrent

5.sciences ( ko chắc )

6. collection