
三角形ABC。D,E是两边的点。∠DEC<=∠DCE。求证∠BDE>∠DBE.

三角形ABC。D,E是两边的点。∠DEC<=∠DCE。求证∠BDE>∠DBE.
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这个不难,当小孩的练习吧。
-yma16-
♂
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04/09/2018 postreply
13:28:14
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