题目

已知向量（m，3），（m，m﹣1）.若//.则m=_____. 答案：【答案】2【解析】根据两个向量共线的坐标表示列方程，解方程求得的值.由于//，所以，即，.故答案为：Terribly sorry, I came home at last. I______of the supermarket______so crowded. A. should have thought; being　　　 B. should think; being C. could have thought; was　　　　 D. could think; was