playbr2

Originally posted by sakura310 at  09:58 PM:
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請容許我指出錯誤: _# L; N( t! U' a- l

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咁你又吾去計

playbr2

Originally posted by sakura310 at  12:08 AM:
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playplay你串我?:fig...

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乜咁快手ㄚㄚㄚㄚ9 L* `+ x4 ^/ J

7 e; q3 d- n0 p! v個答案可以咁.....
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1.ab+bc-ac=0% D6 j1 g8 N9 [; C0 ^; S8 @- t/ b! o
a-c=101
) ^$ E/ k4 h1 sb=ac/(a+c)=(101c+c^2)/(101+2c)+ C* a( E6 z  A, G% t' A
設c=101n! _. P: m6 d5 |& |2 V( N9 [! ~
101n代入c
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[101^2*n+(101n)^2]/(101+202n)
+ }+ l9 ^! s6 ~. d; G=[(101^2)n(n+1)]/[(101)(2n+1)]9 m6 i( A) V+ Z. {
=[101n(n+1)]/(2n+1)
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因為a、b、c是正整數
6 O+ s( F& E/ C( }4 G6 i所以n是正整數' ]3 t$ Y2 `& A
所以[101n(n+1)]/(2n+1)是整數8 v" @4 \- _& h. }& S
2n+1=101(剩下的2n+1=n或2n+1=n+1，n沒有整數解)
. {0 B- u4 N: c9 a7 Jn=50
% Z  u$ |/ `( @7 ?  F" `a=5151  <--a-c=101
3 p* p/ R1 A4 F' f# y/ l1 W* n* i2 ~1 [- ub=2550  <--[101n(n+1)]/(2n+1)- ?; \$ D" T! g  l& J6 V
c=5050  <--c=101n
! U( v, X+ g2 y) X0 O答案:b=2550

playbr2

Originally posted by sakura310 at  12:27 AM:, E' \# l$ j9 a, j$ Y
Filename: DSC01158.JPG$ \" I6 Q+ Q$ f8 I5 Q
Datetime | Downloaded by | Counts
" n/ ~3 I7 d, f% j  f! n2008-01-18 00:25:24 | 阿感 | 2
) N+ ]# q4 ?# }5 B7 g$ B2 ~2008-01-18 00:24:20 | playbr2 | 2
; v( ]9 M* ]! V' n4 D' P" l3 p% a2008-01-18 00:22:02 | 但丁 | 2
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# \. E/ B) X, Z% O& v5 }5 Y' w點解大家都down兩次? XD

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, ^* a! C, u: G; T我第一次開睇左2秒就close 左
3 R+ W. c( u3 D之後DL (就变成第二次)

playbr2

Originally posted by sakura310 at  12:27 AM:
( f" c( ]% J7 ^0 ]7 |; x' _; fFilename: DSC01158.JPG
' e" k4 z( @8 l% _. b. h: d3 W, RDatetime | Downloaded by | Counts' D# u" }7 G! ?. t' p
2008-01-18 00:25:24 | 阿感 | 2, ]' W( F# ~+ }9 L  |
2008-01-18 00:24:20 | playbr2 | 21 N2 i& b" j* k  b' }, T
2008-01-18 00:22:02 | 但丁 | 2
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點解大家都down兩次? XD

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. U  A: E7 t5 P: p, j& j8 V7 t快d捉我錯處9 K9 ^' I5 W4 b: p: G- r/ d3 z
話吾定我都打錯 + - 符號
  a5 _$ H- x" @& D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:
  x, L! s$ z8 T4 f捉錯處就唔敢當
# @- N+ ^7 o8 {+ |- y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! r3 S$ J+ J4 Q; W# h$ w
反而適當地調節一下 , 咁會理性好多
( V3 A- P/ i8 c) C2 C: Q  A6 Y+ Q就好似隻game 由12粒珠 加到13粒珠咁( c5 @% y+ X7 M! Y5 q; L2 y5 z
當''堂''好玩哂
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p.s. 求''堂''字正寫