思路可能沒問題,是不是證明起來會複雜了一點?
所有跟帖:
• 可在四邊形中添線構成兩對相似三角形來證明ef<=ac+bd,但確實沒有你的換邊簡單 -萬斤油- ♂ (0 bytes) () 11/12/2014 postreply 17:50:20
• 可在四邊形中添線構成兩對相似三角形來證明ef<=ac+bd,但確實沒有你的換邊簡單 -萬斤油- ♂ (0 bytes) () 11/12/2014 postreply 17:50:20
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