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2. (5 分) $\left|\frac{2}{1+i}\right|=(\quad)$

Gaokao · Math · previous-year question

  1. A.$2 \sqrt{2}$
  2. B.2
  3. C.$\sqrt{2}$correct
  4. D.1

Answer

C. $\sqrt{2}$

Explanation

解: $\left|\frac{2}{1+i}\right|=\frac{2}{|1+i|}=\frac{2}{\sqrt{2}}=\sqrt{2}$. 故选: C.

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