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幻灯片 1

(2)连结EB、BG、GD、DE (3)连结AF、FC、CH、HA 4. 如图,在平行四边形ABCD中,已知AE、CF分别是∠DAB、 ∠BCD的角平分线,试证明四边形AFCE是平行四边 ...

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幻灯片 1