Question

[tran vu khanh linh]

1/ 2+can3 + 1/ 2-can3 

Answer 1

[Không Tên]

\(\frac{1}{2+\sqrt{3}}+\frac{1}{2-\sqrt{3}}\)

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

\(=\frac{2-\sqrt{3}}{4-3}+\frac{2+\sqrt{3}}{4-3}\)

\(=4\)