如图,点E、F分别在AB、CD上,AE/EB=DF/FC,求证: (1)AB/EB=DC/FC; (2)AB/AE=DC/DF.
问题描述:
如图,点E、F分别在AB、CD上,
=AE EB
,求证:DF FC
(1)
=AB EB
;DC FC
(2)
=AB AE
. DC DF
答
证明:(1)∵
=AE EB
,DF FC
∴
+1=AE EB
+1,DF FC
∴
=AB EB
;DC FC
(2)∵
=AE EB
,DF FC
∴
=EB AE
,FC DF
∴
+1=EB AE
+1,FC DF
∴
=EB+AE AE
,FC+DF DF
∴
=AB AE
.DC DF