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Gaokao Math Practice Question

设 $\mathrm{D}$ 为 $\triangle \mathrm{ABC}$ 所在平面内一点, $\overrightarrow{\mathrm{BC}}=3 \overrightarrow{\mathrm{CD}}$, 则 ($\qquad$)

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

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