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A.maths

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發問:

In trianglePMN,Q is a point on PM such that PQ=3QM.R is the mid-point of PN.Let (→QR)=a and (→QN)=b (a)Express a and b in terms of (→MP) and (→MN) only (b)Hence,express (→MP) and (→MN) in terms of a and b http://i214.photobucket.com/albums/cc72/yesterday0721/13.jpg

最佳解答:

RP = NR = QR - QN = a - b QP = QR + RP = a + a - b = 2a - b MP = (4/3)QP = (4/3)(2a - b) = (8/3)a - (4/3)b MN = QN - QM = b + MQ = b + (1/3)QP = b + (1/3)(2a - b) = (2/3)a + (2/3)b --------------------------------------------------------------------------------------------------- change subjects, you can do it yourself 2008-01-06 14:52:02 補充： 慢左, 不過記得投我一票, 做得好辛苦啊

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