$\mathop {\lim }\limits_{h \to 0} \frac{{\sqrt {x + h} - \sqrt x }}{h} = $

  • A
    $\frac{1}{{2\sqrt x }}$
  • B
    $\frac{1}{{\sqrt x }}$
  • C
    $2\sqrt x $
  • D
    $\sqrt x $

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