题干
—You’ve been driving for hours．Shall I ________？
—No, that’s OK．I enjoy driving and I know you hate it, especially on the highway．
—No, that’s OK．I enjoy driving and I know you hate it, especially on the highway．
A：take back
B：take o
C：take over
D：take u
答案(点此获取答案解析）
C
=(1,2,3),
=（3，0，-1），
=
给出下列等式：
∣=∣
∣ ②
=
③
=
=