Rút gọn: \(\sqrt{a^4.\left(a-2\right)^2}\)

Rút gọn: \(\sqrt{25-\left(7-a\right)^2}\)

Tính: \(\sqrt{6,5+\sqrt{12}}-\sqrt{6,5-\sqrt{12}}+2\sqrt{6}\)

Tính: \(\sqrt{3+\sqrt{5}}-\sqrt{3-\sqrt{5}}-\sqrt{2}\)

Tính: (\(\sqrt{\dfrac{1}{7}}-\sqrt{\dfrac{16}{7}}+\sqrt{7}\)) : \(\sqrt{7}\)

Tính (\(\sqrt{125}+\sqrt{245}-\sqrt{5}\)) : \(\sqrt{5}\)

Tính: \(\sqrt{\dfrac{3}{15}}:\sqrt{\dfrac{36}{45}}\)

Tính: \(\dfrac{\sqrt{180}:\sqrt{5}}{\sqrt{200}:\sqrt{8}}\)

Tính: \(\sqrt{\dfrac{12^5}{3^5\cdot4^3}}\)