Answer and explanation

Correct answer: C. 20

  1. Step 1: 。
  2. Step 2: 二階方陣乘以 ,行列式變為 倍,所以 。
Answer
20.
Why not the others: 10: 只乘了一次 ,二階方陣每列都要乘 ;5:忘了乘以 ;44:行列式中的相減算成了相加。

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