摘要：.在等边中.点分别在边上.且.与交于点． (1)求证:, (2)求的度数． (1)证明:是等边三角形. . 又 .················································································· 4分 ．······································································································· 5分 . 得······························································································· 6分 ······················································································ 9分

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