题目内容
△ABC中,已知点D在边BC上,且BD=2DC,设
=
,
=
,则
等于______.
AB |
a |
AC |
b |
AD |
根据平面向量的运算法则及题给图形可知:
=
+
=
+
=
+
(
+
)=
+
=
+
.
故答案为:
+
.
AD |
AB |
BD |
AB |
2 |
3 |
BC |
AB |
2 |
3 |
BA |
AC |
1 |
3 |
AB |
2 |
3 |
AC |
1 |
3 |
a |
2 |
3 |
b |
故答案为:
1 |
3 |
a |
2 |
3 |
b |
练习册系列答案
相关题目