Forma indeterminata del tipo 0/0
$ \displaystyle\lim_{x \to 100} \frac {\sqrt{x}-10}{x-100} = \displaystyle\lim_{x \to 100} \frac {\sqrt{x}-10}{(\sqrt{x}-10)(\sqrt{x}+10)} = \displaystyle\lim_{x \to 100} \frac {1}{\sqrt{x}+10} = \frac {1}{20} $
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