F.1數學問題(急!10點!)

2010-05-23 8:39 am

圖片參考:http://img25.imageshack.us/img25/5189/mathsi.png


In the figure, AGHC, AFJD, BGFE, BHID and CIJE are straight lines.

(a) Prove that a+c =∠FJE
(b) Prove that a+b+c+d+e = 180°




10點,,thx!!
更新1:

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更新2:

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更新3:

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更新4:

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更新5:

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回答 (5)

2010-05-23 8:57 am
✔ 最佳答案




(a) ∠FJE=∠CAJ+∠ACJ(ext. ∠s of Δ)

=a+c



(b) ∠EFJ=b+d(ext. ∠s of Δ)

a+b+c+d+e

=(a+c)+(b+c)+e

=∠FJE+∠EFJ+∠FEJ

=180(∠sum of Δ)
2010-06-06 9:12 am
係因為我唔鍾意佢抄人姐.我唔會無啦啦鬧人既.
2010-06-03 10:36 am
a)根據ACJ
a+c =∠FJE(三角形外角)
b)你左面少左一點,點B
根據BDF
b+d=∠JFE(三角形外角)
∠FJE+∠JFE+e=180°(三角形內角和)
a+c+b+d+e=180°
a+b+c+d+e=180°
2010-05-31 4:50 am
Ying Tung,用詞別那麼通俗,雖然有言論自由,不過這裡是網上,很多人來看的。兄台,不要再說死這些令人反感的字詞吧!
2010-05-27 3:07 am
(a) ∠FJE=∠CAJ+∠ACJ(ext. ∠ of Δ)
=a+c

(b) ∠EFJ=b+d(ext. ∠ of Δ)
a+b+c+d+e
=(a+c)+(b+c)+e
=∠FJE+∠EFJ+∠FEJ
=180(∠sum of Δ)

2010-06-06 11:36:57 補充:
其實我呢個ac唔係我真既ac,只係用黎發問,咁啱得閒,就答你條q,所以你鍾意檢就檢啦,無哂分就開個個新ac lor!!=]
參考: me


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