Đáp án:
\(-\sqrt{-\sqrt{19}+9}\cdot \left(\dfrac12\right)\sqrt 2+\sqrt{-\sqrt{19}+9}\cdot \dfrac{\sqrt{34}}{2}\)
Giải thích các bước giải:
\(\sqrt{9-\sqrt{19}}\cdot \sqrt{9-\sqrt{17}}\\ = \sqrt{-\sqrt{19}+9}\cdot \sqrt{9-\sqrt{17}}\\ = \sqrt{-\sqrt{19}+9}\left(-\dfrac12\sqrt2+\dfrac{\sqrt{34}}2\right)\\ = -\sqrt{-\sqrt{19}+9}\cdot \left(\dfrac12\right)\sqrt 2+\sqrt{-\sqrt{19}+9}\cdot \dfrac{\sqrt{34}}{2}\)