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Gaokao Math Practice Question

7. (5 分) 在 $\triangle A B C$ 中, $A D$ 为 $B C$ 边上的中线, $E$ 为 $A D$ 的中点, 则 $\overrightarrow{E B}=(\quad)$

  1. A.$\frac{3}{4} \overrightarrow{\mathrm{AB}}-\frac{1}{4} \overrightarrow{\mathrm{AC}}$
  2. B.$\frac{1}{4} \overrightarrow{\mathrm{AB}}-\frac{3}{4} \overrightarrow{\mathrm{AC}}$
  3. C.$\frac{3}{4} \overrightarrow{\mathrm{AB}}+\frac{1}{4} \overrightarrow{\mathrm{AC}}$
  4. D.$\frac{1}{4} \overrightarrow{\mathrm{AB}}+\frac{3}{4} \overrightarrow{\mathrm{AC}}$

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