Gaokao Math Practice Question
3. 已知 $\overrightarrow{A B}=(2,3), \overrightarrow{A C}=(3, t), \overrightarrow{B C}=1$, 则 $\overrightarrow{A B} \cdot \overrightarrow{B C}=$
- A.-3
- B.-2
- C.2
- D.3
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