题目内容
已知D是△ABC所在平面内一点,
=
+
,则( )
| AD |
| 3 |
| 5 |
| AB |
| 2 |
| 5 |
| AC |
A.
| B.
| C.
| D.
|
∵已知D是△ABC所在平面内一点,
=
+
,
∴
=
+
=-
+
=-
+
+
=-
+
=
,
故选A;
| AD |
| 3 |
| 5 |
| AB |
| 2 |
| 5 |
| AC |
∴
| BD |
| BA |
| AD |
| AB |
| AD |
| AB |
| 3 |
| 5 |
| AB |
| 2 |
| 5 |
| AC |
| 2 |
| 5 |
| AB |
| 2 |
| 5 |
| AC |
| 2 |
| 5 |
| BC |
故选A;
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相关题目
已知D是△ABC所在平面内一点,若
=
+
,则|
|:|
|=( )
| AD |
| 1 |
| 3 |
| AB |
| 2 |
| 3 |
| AC |
| BD |
| DC |
| A、1:3 | B、3:1 |
| C、1:2 | D、2:1 |