平行線上的角(1條)&因式分解(2條)

2010-11-24 8:48 pm

1.http://s59.radikal.ru/i166/1011/11/e8e066ce7616.jpg

已知AB//EF,求x

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因式分解
1.10x^2 - 22xy + 4y^2

2.39m^2 - 82mn +8n^2

回答 (2)

2010-11-24 11:49 pm

✔ 最佳答案

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圖片參考：http://img543.imageshack.us/img543/6125/angle.png

2010-11-24 15:52:14 補充：
http://img543.imageshack.us/img543/6125/angle.png

2010-11-24 15:57:06 補充：
2. another solutions =(82-74)/78 = 8/78 =4/39
(x-4/39)=(39x-4)
in terms of m & n =(39m-4n)

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2010-11-24 9:28 pm

[130-(x+25)]=[120-(2x-30)]

130-x-25=120-2x+30

x=120+30-130+25

=45?

10x^2 - 22xy + 4y^2
=2(5x^2-11xy+2y^2)
=2(5x-y)(x-2y)

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