已知向量 ,则 等于:
Answer and explanation
Correct answer: A.
其他选项为什么不对: 代入检验,、、都与上面算出的 不符。
- Step 1: 。
Answer
.
Practise more 函数与基本初等函数.
Free questions with an explanation for every one, and full timed Gaokao mock tests.
Correct answer: A.
Free questions with an explanation for every one, and full timed Gaokao mock tests.