Math.......

1a) 0,3,8,15 -> 24,35,48,63
reason: 3-0=3,8-3=5,15-8=7...24-15=9,35-24=11,48-35=13,63-48=15
formula: n^2-1 [or (n+1)(n-1)]

1b) 2,6,12,20 -> 30,42,56,72
reason: 6-2=4,12-6=6,20-12=8...30-20=10,42-30=12,56-42=14,72-56=16
formula: n(n+1) [or n^2+n]

2) 先睇分子: 1,5,9,13
5-1=4,9-5=4,13-9=4,...
後睇分母: 3,5,7,9
5-2=2,7-5=2,9-7=2...
the sequence is 1/3,5/5,9/7,13/9,17/11,21/13,25/15,29/17
formula: (4n-3)/(2n+1)

希望幫到你la

2007-10-25 19:34:35 補充：
乜樓上果個抄我咁矛ga = =

1.find the number patterns of the following sequences.
a)0,3,8,15
b)2,6,12,20

1A)
+2 +2
+3,+5,+7
0,3, 8, 5

1B)
+2 +2
+4,+6,+8
2,6, 12,20

2)



1/3,5/5,9/7,13/9


sor i dont know wor

2007-10-24 18:27:56 補充：
only know 1/3 |1/31 5 9 13 upper:+4 +4 +4- - - - under: +2 +2 +2 3 5 7 9

2007-10-25 16:46:28 補充：
oh!!! thanks the downs!!!1　 5 　9 　13　 upper:+4 +4 +4-　 -　 - 　- 　　under: +2 +2 +2 3　 5 　7　 9 (4n-3)/(2n+1)　is the patterns of the sequencese.g.n=1,(4(1)-3)/(2(1)+1)=(4-3)/(2+1)=1/3n=2,(4(2)-3)/(2(2)+1)=5/5

2007-10-26 07:38:18 補充：
吹呀

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1.a)+3,+5,+7
b)+4,+6,+8
2.i don't know