Answer and explanation

Correct answer: D. -7

  1. Step 1: 內積為對應分量乘積之和。
  2. Step 2: 。
Answer
-7.
Why not the others: 11:算成了外積(行列式);-1:把對應分量交叉相乘再相加;-4:第一個分量乘積算了兩次。

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