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2011-04-22 7:02 am

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can anyone tell me why a/b=DE/BE=d/c???

回答 (1)

2011-04-22 8:03 am
✔ 最佳答案
△ABD中a/b =DE/BE (高相同,所以底邊比=面積比)同理,△BCD中d/c =DE/BE所以a/b =DE/BE =d/c
參考: me


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