$\sqrt[2]{5-2√6}$ + $\sqrt[2]{5+2√6}$ - $\frac{11}{2√3 + 1}$
= $\sqrt[2]{3-2√6+2}$ + $\sqrt[2]{3+2√6+2}$ - $\frac{11}{2√3+1}$
= $\sqrt[2]{(√3-√2)²}$ + $\sqrt[2]{(√3+√2)²}$ - $\frac{11}{2√3+1}$
= (√3 - √2) + (√3 +√2) - $\frac{11}{2√3+1}$
= √3 -√2 + √3 + √2 -$\frac{11}{2√3+1}$
= 2√3 - $\frac{11}{2√3+1}$
= $\frac{2√3(2√3+1) - 11}{2√3 + 11}$
= $\frac{12 + 2√3 - 11}{2√3 +1}$
= $\frac{1 + 2√3}{2√3 + 1}$
= 1
~CHÚC BẠN HỌC TỐT~