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(1) As shown in figure 1, the ∫ quadrilateral ABCD is a square,

∴AB=BC=CD=AD,∠DAB=∠ABC=90,∠EBC=∠GBC=∠ABD=∠BDC=45。

∴∠BEC+∠BCE=45

∵EK⊥CE,

∴∠KEC=90。

∴∠AEK+∠BEC=90

∴∠AEK=∠BCE,

∴△AKE∽△BEC,

∴AEBC=KECE.

AE = BE,

∴AEAB=BEAB= 12,

∴AEBC=BECD= 12,

∴kece= 12;

∠EAF=∠GBC,∠AEK=∠BCE,

∴△AFE∽△BGC,

∴EFCG=AEBC= 12,

∴EF= 12GC.

∠∠ABD =∠BDC,∠EGB=∠CGD,

∴△BEG∽△DCG,

∴BECD=EGCG,

∴EGCG= 12,

∴EG= 12GC,

∴ef=eg;

(2) As shown in Figure 2, AE = 2BE,

∴AEAB=23,BEAB= 13,

∴AEBC=23,BECD= 13.

∠∠DAB =∠ABC,∠AEK=∠BCE,

∴△AKE∽△BEC,

∴AEBC=KECE,

∴KECE=23.

∠EAF=∠GBC,∠AEK=∠BCE,

∴△AFE∽△BGC,

∴EFCG=AEBC=23,

∴EF=23GC.

∠∠ABD =∠BDC,∠EGB=∠CGD,

∴△BEG∽