题目内容
已知P为边长为1的等边△ABC所在平面内一点，且满足
=
+2
，则
•
=______．
| CP |
| CB |
| CA |
| PA |
| PB |
| PA |
| PB |
| PC |
| CA |
| PC |
| CB |
| PC |
| PC |
| CB |
| CA |
| CB |
| CA |
=(
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CA |
| CB |
| CA |
故答案为 3．
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=(
故答案为 3．
题目内容
| CP |
| CB |
| CA |
| PA |
| PB |
| PA |
| PB |
| PC |
| CA |
| PC |
| CB |
| PC |
| PC |
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CB |
| CA |
| CA |
| CB |
| CA |
，则
= ．
，则
= ．
，则
= ．