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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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國三數學~比例線段的三角型題目
Sep 14th 2013, 13:26

各位大大好:

如父網址:
http://img30.imageshack.us/img30/563/6u9.png

1.在三角形(網址裡題號1的三角形)ABC中，若D點在線AB上，E點在線AC上，則在下列哪一個條件下，不一定使得線DE平行線BC?
(A)線AD:線AB=線AE:線AC
(B)線AD:線BD=線AE:線EC
(C)線AD:線AB=線DE:線BC
(D)線BD:線AB=線EC:線AC

2.在網址裡題號2的三角形，試問線AF:線FE?
(A) 1 : 2
(B) 3 : 4
(C) 3 : 2
(D) 2 : 3

3.承上題，試問x?
(A)1
(B)1/3
(C)3/4
(D)8/3

4.在網址裡題號3的三角形，線DE平行線AB，線AF:線FC=5 : 3，且線AD=X+1，
線BD=2X-1，則X=______________?

感謝各位了!!

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