Ta có :

\(B.\sqrt{2}=\left(\sqrt{3+\sqrt{5}}-\sqrt{3-\sqrt{5}}-\sqrt{2}\right).\sqrt{2}\)

\(=\sqrt{6+2\sqrt{5}}-\sqrt{6-2\sqrt{5}}-2\)

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

\(=\sqrt{5}+1-\left(\sqrt{5}-1\right)-2=0\)

\(\Rightarrow B=0\)

102345678

987654321

-Thua keo này, bày keo khác.

-

Tại vì..... Search Google