Answer and explanation

Correct answer: C. 4

  1. Step 1: ,。
  2. Step 2: 所以原式 。
Answer
4.
Why not the others: 8:把相減誤算成相加;39:把真數直接相減,沒有取對數;-4:被減數與減數顛倒。

Practise more 多項式函數、指數與對數.

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