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(8分)如圖,E、FABCD對角線上的兩點,且.

求證:(1);
(2).
證明:(1)四邊形是平行四邊形,
.
.················································································· 2分
,
.
.·················································································· 3分
········································································ 4分
(2)由
.,·········································································· 5分
四邊形是平行四邊形. ·································································· 7分
.  8分解析:
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