playbr2

Originally posted by sakura310 at  09:58 PM:% v) R/ |3 v" y4 B4 R

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7 P# x' q6 ]: m5 R' x. n6 t對不起1 v$ O4 E0 }6 s5 `0 g; C
請容許我指出錯誤4 n. {8 L6 _6 T

0 o, A  n1 C) u在...

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咁你又吾去計

playbr2

Originally posted by sakura310 at  12:08 AM:
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$ W9 n+ _1 P, y4 {  g6 hplayplay你串我?:fig...

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  E) c8 e" K  [( t7 [乜咁快手ㄚㄚㄚㄚ& f; ~; V! S+ m4 |0 g( s3 r

9 L" L# l) K- h. a個答案可以咁.....
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9 Z' T: b- _$ z' A1.ab+bc-ac=0" W( F8 l5 T7 s& w$ l
a-c=101
, i% x& H- N4 E1 n" f( Fb=ac/(a+c)=(101c+c^2)/(101+2c). @, w. w; j4 X5 e
設c=101n
" |  X7 V) J6 v/ `+ q" U101n代入c
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[101^2*n+(101n)^2]/(101+202n)* e4 t3 p( Z: e3 _; R/ c
=[(101^2)n(n+1)]/[(101)(2n+1)]
2 @9 |1 z* c! `6 w- o1 v=[101n(n+1)]/(2n+1)
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因為a、b、c是正整數2 }4 `2 G( W: [" Z1 J) m
所以n是正整數1 `- O) j: w" i" @1 `( e* _5 Y( Q
所以[101n(n+1)]/(2n+1)是整數% S% c5 N- g1 Q& U# W
2n+1=101(剩下的2n+1=n或2n+1=n+1，n沒有整數解)4 Z4 U! \$ |& @& x
n=50- S( ]' A4 e# E
a=5151  <--a-c=101
$ y( j4 X. L$ t, h1 k/ Rb=2550  <--[101n(n+1)]/(2n+1)
/ g) }; K- D2 lc=5050  <--c=101n, w. t0 @! h0 o- D( ^
答案:b=2550

playbr2

Originally posted by sakura310 at  12:27 AM:
' n: a/ k( x" ]/ ~+ [  h3 sFilename: DSC01158.JPG7 Z+ J# `6 O/ t
Datetime | Downloaded by | Counts  t6 Q1 g& U* S, M4 R" d8 C
2008-01-18 00:25:24 | 阿感 | 2# p: p$ a% I# N3 J; B8 R* L. f
2008-01-18 00:24:20 | playbr2 | 2( I( S. ]+ x0 l4 O- O
2008-01-18 00:22:02 | 但丁 | 2
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點解大家都down兩次? XD

4 C) w2 Z/ Y' Y' D, Q' Y( U1 y( D
, v7 u  ^2 r& s  i我第一次開睇左2秒就close 左* b7 X5 b0 I+ R, `1 K6 Y: M( }
之後DL (就变成第二次)

playbr2

Originally posted by sakura310 at  12:27 AM:
6 j& a6 q' |! H, _1 pFilename: DSC01158.JPG2 T5 N* Y& {  Q6 c+ F9 h
Datetime | Downloaded by | Counts
, t# f+ t5 m% R8 I2008-01-18 00:25:24 | 阿感 | 2
5 O* A: ]0 }, Z2008-01-18 00:24:20 | playbr2 | 2
/ U4 N% A. o. d4 b) C6 H2008-01-18 00:22:02 | 但丁 | 2
4 E6 w* ~) z' V" w4 B4 S3 M& F+ Y, V$ z( b' F
點解大家都down兩次? XD

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快d捉我錯處* L4 e8 h  I5 Q7 Y8 C5 S
話吾定我都打錯 + - 符號
/ w) ?: [9 u5 H/ }4 N係電腦打答案...的確幾煩...又哂時間...

playbr2

Originally posted by sakura310 at  10:22 AM:
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不懂的話就問playplay,佢會知答案

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playbr2

Originally posted by sakura310 at  06:47 AM:
/ \8 g: B# y4 D2 k' ]5 V捉錯處就唔敢當
: {8 r  V4 u8 f; n- ^* \不過,c=101n哥度(解...

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都係睇餸食飯姐 , 無理由因為題目冇同你假設就下下大包圍架
* k5 J, y! y7 \' _3 j! r反而適當地調節一下 , 咁會理性好多
& n5 d, I2 [/ @. B+ D# {就好似隻game 由12粒珠 加到13粒珠咁6 I' N1 [& ~$ Z
當''堂''好玩哂8 ?+ Z( X0 v' r% `$ F- F' ]
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p.s. 求''堂''字正寫