a2(﹣a+b﹣c)与﹣a(a2﹣ab+ac)的关系是[ ]
A.相等
B.互为相反数
C.前式是后式的﹣a倍
D.前式是后式的a倍
答案:A
连词成句。
1. are There fish in river the many
2. is my holiday This picture
3. is a forest There the park in
4. no are There buildings tall
5. can many fish You see
对于长度为n的顺序存储的线性表,当随机插入和删除一个元素时,需平均移动 【3】 个元素。