问题
填空题
在平行四边形ABCD中,
|
答案
∵在平行四边形ABCD中,
=2AO
,OC
∴
=AO 2 3
=AC
(2 3
+AB
)AD
又∵
=OB
-AB
=AO
-AB
(2 3
+AB
)=AD 1 3
-AB 2 3 AD
又∵
=AB
,a
=AD
,b
∴
=OB 1 3
-a 2 3 b
故答案为:1 3
-a 2 3 b
在平行四边形ABCD中,
|
∵在平行四边形ABCD中,
=2AO
,OC
∴
=AO 2 3
=AC
(2 3
+AB
)AD
又∵
=OB
-AB
=AO
-AB
(2 3
+AB
)=AD 1 3
-AB 2 3 AD
又∵
=AB
,a
=AD
,b
∴
=OB 1 3
-a 2 3 b
故答案为:1 3
-a 2 3 b