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Упрости:

1. \(\dfrac{1}{\sqrt{17}-4}-\dfrac{1}{\sqrt{17}+4}=\) [ ].
2. \(\dfrac{\sqrt{7}+\sqrt{3}}{\sqrt{7}-\sqrt{3}}-\dfrac{\sqrt{7}-\sqrt{3}}{\sqrt{7}+\sqrt{3}}=\) [ ].