8. \[ 1 - \frac{5}{\sqrt{196}} - \frac{5}{(2\sqrt{21})^2} - \frac{\sqrt{25}}{204} - \frac{(\sqrt{5})^2}{374} \] 10. \[ \left( -\frac{\sqrt{5}}{4} \right)^2 - \frac{\sqrt{9}}{4} : (-4, 5) - \frac{25}{16} \sqrt{\frac{64}{9}} \] 9. \[ \frac{1}{9} \sqrt{(-9)^2} - | -3^2 | - 14 - \sqrt{1 - \frac{48}{49}} + \frac{25}{4} \] 11. \[ \frac{2}{5} \left[ \frac{9}{25} \cdot \left(-\frac{1}{5}\right)^2 - \sqrt{49} \right] \left( \frac{19}{20} \right)^0 - \frac{11}{15} \]

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----- Nội dung ảnh -----
8. \[ 1 - \frac{5}{\sqrt{196}} - \frac{5}{(2\sqrt{21})^2} - \frac{\sqrt{25}}{204} - \frac{(\sqrt{5})^2}{374} \]

10. \[ \left( -\frac{\sqrt{5}}{4} \right)^2 - \frac{\sqrt{9}}{4} : (-4, 5) - \frac{25}{16} \sqrt{\frac{64}{9}} \]

9. \[ \frac{1}{9} \sqrt{(-9)^2} - | -3^2 | - 14 - \sqrt{1 - \frac{48}{49}} + \frac{25}{4} \]

11. \[ \frac{2}{5} \left[ \frac{9}{25} \cdot \left(-\frac{1}{5}\right)^2 - \sqrt{49} \right] \left( \frac{19}{20} \right)^0 - \frac{11}{15} \]