F1 maths (15 marks)

2008-02-25 1:13 am
求下列各圖中的x

(ftp://ftp.php0h.com/htdocs/antony.jpg)

AC:p0_1606822
PW:27756472

回答 (2)

2008-02-25 3:41 am
✔ 最佳答案
180∘-(5x+55∘)=∠ABC (adj. ∠s on st. line)
......
∠ABC = 125∘-5x

∠ACB = 85∘ (vert. opp. ∠s)

(125∘-5x)+3x+85∘=180∘(∠ sum of △)
....
x=15∘
參考: me
2008-02-25 1:19 am
x = 15

2008-02-24 17:20:34 補充:
要steps 嗎?
參考: myself


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