(1) ∠DBE=∠BDF=120°
BE/AB=CE/CF=BE/BD
AD/DF=CE/CF=BD/DF
△BDE∽△DFB
BE/DB=BD/DF
BE/3=3/2
BE=4.5
(2)△BDE∽△DFB
∴BE/DB=BD/DF
BE/DB=BE/BC
BD/DF=DC/DF
∴BE/BC=DC/DF,∠EBC=∠FDC=60
∴△BEC∽△DCF
(3)△BDE∽△DFB
∠BED=∠DBF
又∠BDE=∠HDB
△BDE∽△HDB
DE/BD=BD/DH
BD^2=DH*DE
(1) ∠DBE=∠BDF=120°
BE/AB=CE/CF=BE/BD
AD/DF=CE/CF=BD/DF
△BDE∽△DFB
BE/DB=BD/DF
BE/3=3/2
BE=4.5
(2)△BDE∽△DFB
∴BE/DB=BD/DF
BE/DB=BE/BC
BD/DF=DC/DF
∴BE/BC=DC/DF,∠EBC=∠FDC=60
∴△BEC∽△DCF
(3)△BDE∽△DFB
∠BED=∠DBF
又∠BDE=∠HDB
△BDE∽△HDB
DE/BD=BD/DH
BD^2=DH*DE