题目
题型：不详难度：来源：
| AB |
| CD |
| AC |
| DB |
| AD |
| BC |
| A．0 | B．
| C．1 | D．无法确定 |
答案
| AB |
| CD |
| AC |
| DB |
| AD |
| BC |
| AC |
| CB |
| CD |
| AC |
| DB |
| AD |
| BC |
=
| AC |
| CD |
| CB |
| CD |
| AC |
| DB |
| AD |
| BC |
=
| AC |
| CD |
| DB |
| CB |
| CD |
| DA |
=
| AC |
| CB |
| CB |
| CA |
=
| CB |
| AC |
| CA |
=
| CB |
| 0 |
故选A
核心考点
试题【在空间四边形ABCD中，AB•CD+AC•DB+AD•BC的值为（ ）A．0B．32C．1D．无法确定】；主要考察你对平面向量数量积的运算等知识点的理解。[详细]
举一反三
| π |
| 6 |
| π |
| 2 |
| 3 |
| CA |
| CB |
| CM |
| A．1 | B．-1 | C．
| D．-
|
| a |
| b |
| a |
| b |
| A．（1，1，1） | B．0 | C．-2 | D．（0，0，-2） |
| x2 |
| 2 |
| y2 |
| b2 |
| 3 |
| PF1 |
| PF2 |
| A．-12 | B．-2 | C．0 | D．4 |
| a |
| i |
| i |
| k |
| b |
| i |
| j |
| k |
| a |
| b |
| A．-1 | B．-3 | C．-5 | D．-15 |