八上数学等边三角形如图,△ABC是等边三角形,延长BC至D,延长BA至D,使AE=BD,连接CE,DE,求证CE=DE.如图,△ABC是等边三角形,延长BC至D,延长BA至E,不是延长BA至D,使AE=BD,连接CE,DE,求证CE=DE.

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