\(\sqrt{7}\left(\sqrt{7}+\sqrt{\dfrac{4}{7}}-\sqrt{\dfrac{16}{343}}\right)\)

\(\sqrt{3+\sqrt{5}}.\sqrt{2}\)

\(\dfrac{\sqrt{28y^6}}{\sqrt{7y^4}}vớiy< 0\)

\(\sqrt{7-4\sqrt{3}}+\sqrt{7+4\sqrt{3}}\)

\(\sqrt{\sqrt{3}}.\sqrt{\sqrt{3}}\)

\(\sqrt{3^2.\left(-4\right)^2}\)

Rút gọn:

\(\sqrt{4x^2}.\sqrt{\dfrac{9}{x^4y^2}}\)

\(\sqrt{\sqrt{3}}.\sqrt{\sqrt{3}}\)

giải pt

\(\sqrt{x^2+x}=x\)

giải pt

\(\sqrt{x^2+4}=\sqrt{3x+8}\)