问题
填空题
在△ABC中,M是BC的中点,AM=1,点P在AM上且满足
|
答案
M是BC的中点,
=2AP
,AM=1PM
•(PA
+PB
)=PC
•2PA
=PM
•PA
=-(AP
)2PA
=-(2 3
)2=-MA
.4 9
故应填-
.4 9
在△ABC中,M是BC的中点,AM=1,点P在AM上且满足
|
M是BC的中点,
=2AP
,AM=1PM
•(PA
+PB
)=PC
•2PA
=PM
•PA
=-(AP
)2PA
=-(2 3
)2=-MA
.4 9
故应填-
.4 9