问题
填空题
已知△ABC中,点D在BC边上,且
|
答案
∵
=2CD
,DB
∴
=CD 2 3
=CB
(2 3
-AB
)AC
=2 3
-AB 2 3 AC
∵
=rCD
+sAB
,AC
∴r=
,s=-2 3 2 3
∴r+s=0,
故答案为:0
已知△ABC中,点D在BC边上,且
|
∵
=2CD
,DB
∴
=CD 2 3
=CB
(2 3
-AB
)AC
=2 3
-AB 2 3 AC
∵
=rCD
+sAB
,AC
∴r=
,s=-2 3 2 3
∴r+s=0,
故答案为:0