amaths
2008-01-13 11:22 pm
Given that the position vectors of A,B,C are a,b,c respectively.Let c=ma+nb,where m and n are real constnts.If A ,B and C are collinear,find the relation between m and n
回答 (1)
2008-01-14 12:06 am
✔ 最佳答案
let vectorBC=k(vectorAB)ma+(n-1)b=k(-a+b)
so m/(n-1)=-1
m+n=1
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