Maths problems [mixed 3]－zogfly3的部落格

標題:

Maths problems [mixed 3]

發問:

http://i226.photobucket.com/albums/dd260/wingreally/maths006.jpghttp://i226.photobucket.com/albums/dd260/wingreally/maths001.jpghttp://i226.photobucket.com/albums/dd260/wingreally/maths002.jpghttp://i226.photobucket.com/albums/dd260/wingreally/maths003.jpghttp://i226.photobucket.com/albums/dd260/wing... 顯示更多 http://i226.photobucket.com/albums/dd260/wingreally/maths006.jpg http://i226.photobucket.com/albums/dd260/wingreally/maths001.jpg http://i226.photobucket.com/albums/dd260/wingreally/maths002.jpg http://i226.photobucket.com/albums/dd260/wingreally/maths003.jpg http://i226.photobucket.com/albums/dd260/wingreally/maths004.jpg http://i226.photobucket.com/albums/dd260/wingreally/maths005.jpg Can anyone calculate them in details? thx!

最佳解答:

(34) x-intercept of L1 = -b/a x-intercept of L2 = -d/c Therefore -b/a = -d/c, so ad = bc (35) a2 - ab - 2b2 = 0 (a + b)(a - 2b) = 0 a = -b or a = 2b (rejected since ab
其他解答:

thx so much, but 我唔係太明點解 2/(√3 - 1) = √3 + 1 2009-07-05 19:15:49 補充：明啦! thx~