FORM 4 A MATHS (trinomial) part b only

2006-12-16 8:36 pm

part a) express K1,K2 in term of a:

ANS:K1=6a+15
K2=30a+20

part b) IF 6,K1,K2 are in A.P. find a:

ANS:2over9,即2/9

part 『b』 plz, a我計到..

回答 (1)

2006-12-16 8:42 pm

✔ 最佳答案

A.P.即係common difference會一樣..
所以..
K2-K1=K1-6
(30a+20)-(6a+15)=(6a+15)-6
30a+20-6a-15=6a+15-6
18a=4
a=4/18
a=2/9

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