題組內容
II. (50 points) Fill in the following blanks.
4. The value of $$\lim_{x \to \infty} \left(\sqrt{x^2 + 4x} - x\right)$$ equals__ (4)__.
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II. (50 points) Fill in the following blanks.
4. The value of $$\lim_{x \to \infty} \left(\sqrt{x^2 + 4x} - x\right)$$ equals__ (4)__.