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[tex]1) \frac{ \sqrt{x} -1}{x-1} \\ \\
4) \frac{17- \sqrt{17}}{\sqrt{17}} \\ \\
6) \frac{\sqrt{21}-3}{7- \sqrt{21}} [/tex]
[tex]1) \frac{ \sqrt{x} -1}{x-1} \\ \\
4) \frac{17- \sqrt{17}}{\sqrt{17}} \\ \\
6) \frac{\sqrt{21}-3}{7- \sqrt{21}} [/tex]
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1) =4) =