1. Tính A = 

- Hướng dẫn giải

1. A = $\sqrt{54}+2\sqrt{24}-\sqrt{150}$ = $\sqrt{9.6}+2\sqrt{4.6}-\sqrt{25.6}$

= $3\sqrt{6}+4\sqrt{6}-5\sqrt{6}=2\sqrt{6}$

2. B = $\sqrt{24+8\sqrt{5}}+\sqrt{9-4\sqrt{5}}$

= $\sqrt{{\left(2\sqrt{5}+2\right)}^2}+\sqrt{{\left(\sqrt{5}-2\right)}^2}$

= $2\sqrt{5}+2+\sqrt{5}-2=3\sqrt{5}$