Đáp án+Giải thích các bước giải:
`A=(\frac{1}{3-\sqrt{5}}+\frac{1}{3+\sqrt{5}}):\sqrt{5}`
`=(\frac{3+\sqrt{5}+3-\sqrt{5]}{9-5}).\frac{1}{\sqrt{5}}`
`=\frac{6}{4}.\frac{1}{\sqrt{5}}`
`=\frac{3}{2\sqrt{5}}`
`B=\sqrt{48}+\sqrt{5\frac{1}{3}}+2\sqrt{75}-5\sqrt{1\frac{1}{3}}`
`=4\sqrt{3}+\sqrt{\frac{16}{3}}+10\sqrt{3}-5\sqrt{\frac{4}{3}}`
`=14\sqrt{3}+\frac{4}{\sqrt{3}}-\frac{10}{\sqrt{3}}`
`=14\sqrt{3}+\frac{4-10}{\sqrt{3}}`
`=14\sqrt{3}+\frac{\sqrt{3}.(-2\sqrt{3})}{\sqrt{3}`
`=14\sqrt{3}-2\sqrt{3}`
`=12\sqrt{3}`
