(1)作FM⊥CD于M
可证△AEH∽△DHG∽△MGF
∴AE=DH=6-2=4
DG=AH=2
∴△FCG的面积=12×6×2=6
(2)可证△AEH∽△DHG
∴DGAH=DHAE即DG2=4x
∴DG=8x∴y=△FCG的面积=12×(8-8x)×2=8-8x
∵{8-8x>0x≤8∴1<x≤8
∴当x=8时,y的最大值为7.
(1)作FM⊥CD于M
可证△AEH∽△DHG∽△MGF
∴AE=DH=6-2=4
DG=AH=2
∴△FCG的面积=12×6×2=6
(2)可证△AEH∽△DHG
∴DGAH=DHAE即DG2=4x
∴DG=8x∴y=△FCG的面积=12×(8-8x)×2=8-8x
∵{8-8x>0x≤8∴1<x≤8
∴当x=8时,y的最大值为7.