Tìm x biết

\(\sqrt{x-1}-\sqrt{x-2}=1\)

so sanh

\(\sqrt{2020}-\sqrt{2019}va\sqrt{2021}-\sqrt{2020}\)

cm dang thuc

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

Tim x biet :

\(\sqrt{10+\sqrt{3x}}=2+\sqrt{6}\)

\(\sqrt{2-\sqrt{ }2\cdot\sqrt{ }5-2}\) - \(\sqrt{2+2\sqrt{ }5-2}\)

Rut gon

cho A=\(\frac{\sqrt{x}}{\sqrt{x}-2}\)

tinh A khi x=9