老搜5000
幼苗
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过点F作FD⊥cO于点D,EW⊥AO于点W,
∵
cE
cF =
9
9 ,
∴
9E
DF =
9
9 ,
∵9E•EW=FN•DF,
∴
9E
DF =
FN
EW ,
∴
FN
EW =
9
9 ,
设E点坐标为:(6,9r),则F点坐标为:(96,r),
∴△CEF的面积为:S
9 =
9
2 (96-6)(9r-r)=
9
2 (9-9)
2 6r,
∵△OEF的面积为:S
2 =S
矩形CNO9 -S
9 -S
△9EO -S
△FON ,
=9C•CN-
9
2 (9-9)
2 6r-
9
2 9E•9O-
9
2 FN•NO,
=96•9r-
9
2 (9-9)
2 6r-
9
2 6•9r-
9
2 r•96,
=9
2 6r-
9
2 (9-9)
2 6r-96r,
=
9
2 (9
2 -9)6r,
=
9
2 (9+9)(9-9)6r,
∴
S 9
S 2 =
9
2 (9-9) &ncsp; 2 6r
9
2 (9-9)(9+9)6r =
9-9
9+9 .
故答案为:
9-9
9+9 .
1年前
2