Question

Rút gọn: ( làm hộ vs mình đúng cho =)))

\(A=\frac{\sqrt{3}+\sqrt{11+6\sqrt{2}}-\sqrt{5+2\sqrt{6}}}{\sqrt{2}+\sqrt{6+2\sqrt{5}}-\sqrt{7+2\sqrt{10}}}\)

Answer 1

\(A=\frac{\sqrt{3}+\sqrt{11+6\sqrt{2}}-\sqrt{5+2\sqrt{6}}}{\sqrt{2}+\sqrt{6+2\sqrt{5}}-\sqrt{7+2\sqrt{10}}}=\frac{\sqrt{3}+\sqrt{9+2.3\sqrt{3}+2}-\sqrt{3+2\sqrt{3}\sqrt{2}+2}}{\sqrt{2}+\sqrt{5+2\sqrt{5}.1+1}-\sqrt{5+2\sqrt{5}\sqrt{2}+2}}\)

\(=\frac{\sqrt{3}+\sqrt{\left(3+\sqrt{2}\right)^2}-\sqrt{\left(\sqrt{3}+\sqrt{2}\right)^2}}{\sqrt{2}+\sqrt{\left(\sqrt{5}+1\right)^2}-\sqrt{\left(\sqrt{5}+\sqrt{2}\right)^2}}=\frac{\sqrt{3}+3+\sqrt{2}-\sqrt{3}-\sqrt{2}}{\sqrt{2}+\sqrt{5}+1-\sqrt{5}-\sqrt{2}}\)

\(=\frac{3}{1}=3\)

Answer 2

A=\(\frac{\sqrt{3}+3+\sqrt{2}-\sqrt{2}-\sqrt{3}}{\sqrt{2}+1+\sqrt{5}-\sqrt{2}-\sqrt{5}}=\frac{3}{1}=3\)

Answer 3

là 3