（8分）如圖，E、F是□ABCD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
得
.，···························································································· 5分
四邊形
是平行四邊形. ··················································································· 7分
. 8分
解析:略
科目：初中數學 來源： 題型：
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