题目内容
如图,在等边三角形ABC中,D、E分别在AC、AB上,且,.试说明:△ADE∽△CDB
证明见解析
解:∵是等边三角形,
∴,.·················· (3分)
∵,
∴.······························ (5分)
∵,
∴,
∴,···························· (7分)
∴. (9分)
利用等量代换和比例线段求得,从而得出结论
∴,.·················· (3分)
∵,
∴.······························ (5分)
∵,
∴,
∴,···························· (7分)
∴. (9分)
利用等量代换和比例线段求得,从而得出结论
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