Gaokao Math Practice Question
3. (5 分) 已知向量 $\vec{a}=(1, m), \vec{b}=(3,-2)$, 且 $(\vec{a}+\vec{b}) \perp \vec{b}$, 则 $m=(\quad)$
- A.-8
- B.-6
- C.6
- D.8
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