sakura310

Filename: DSC01158.JPG$ M9 v; M: {9 c  I# K1 _+ U
Datetime | Downloaded by | Counts. T0 |5 g" N( U5 n. C( q/ K
2008-01-18 00:25:24 | 阿感 | 23 @: J8 F$ W1 p# M5 \
2008-01-18 00:24:20 | playbr2 | 25 A# }( R$ Q  h9 u1 Q( v$ F$ i1 s
2008-01-18 00:22:02 | 但丁 | 2" J/ Q/ l  b" x; N) a8 l* q

4 i$ E: E4 Y; R8 f點解大家都down兩次? XD

playbr2

Originally posted by sakura310 at  12:27 AM:
1 j. g, X/ Q3 B$ ~: ]7 T1 KFilename: DSC01158.JPG
* @$ F2 f; q; Y  A# L3 sDatetime | Downloaded by | Counts0 w' D4 o% x9 V9 ~- Q; j, Y# A
2008-01-18 00:25:24 | 阿感 | 2
, `9 I5 j8 H& V; M2008-01-18 00:24:20 | playbr2 | 2
0 a) c$ l) ^9 f% k% i2008-01-18 00:22:02 | 但丁 | 2( Y5 c5 l' K* x. E( g/ g9 n# I

# t+ W! _7 [1 G( H+ g點解大家都down兩次? XD

: {2 n( }% k5 x  w5 |& ~) N* B9 L  @8 g4 \
我第一次開睇左2秒就close 左! [4 a+ Y8 T% i; h& n
之後DL (就变成第二次)

playbr2

Originally posted by sakura310 at  12:27 AM:# P' N" c- q* c, n0 q: p9 B. o, |" D
Filename: DSC01158.JPG
0 `& @# d: m! O4 T8 ?Datetime | Downloaded by | Counts
( |) A( o3 B0 _4 X0 e0 b( t2008-01-18 00:25:24 | 阿感 | 2
1 t! y* \. y+ E' {  T1 P' x8 D2008-01-18 00:24:20 | playbr2 | 2
5 B( t: w/ s. b$ |2008-01-18 00:22:02 | 但丁 | 2" J, g! T3 l4 t$ r
* V3 P) _- t+ H
點解大家都down兩次? XD

3 p5 u' V$ o" p8 p  q: q
5 M& c# @3 b  ~% @7 r( x3 E3 s
快d捉我錯處, P3 S8 B  F0 Z) w0 Q
話吾定我都打錯 + - 符號
7 ^0 ?9 b5 g6 C1 x5 t! U' c係電腦打答案...的確幾煩...又哂時間...

sakura310

捉錯處就唔敢當
) t' b# |, g% l7 H5 ]# e% p不過,c=101n哥度(解除n係正整數的限制,只是整數)6 l/ b8 p' P% n$ v' u
就一下子限制左c一定要係101的倍數(好像看懸疑片,突然劇情說出一些事前沒提及過的線索,不爽~)
  e2 y/ @7 l! @, v* m" Y' S* l知道{101,0,0}和{5151,2550,5050}係答案的話,當然沒問題# b5 p. @# x) a$ M+ G# q
但原先是不知答案,所以唔知有無失根2 @: y; N* G( P  t( r9 P- D

' ^4 {# x- }$ t7 A- c' D9 `. B有時見到題目都感到有點不爽
1 P# C7 ?* w8 A5 W1 S8 I  o題目所求的答案是整數,正整數,有理數,實數等等應該說清楚
" B% `. B# d. |# T; f有些題目,整數解和正整數解分別好大的說,要找出整數解集有時可不是件易事= =

cutec

冇答案ga....6 C# k5 m& J7 m) }: h& U+ s

1 k+ A1 N2 k7 D2 D+ @0 u# a! _2條equation solve 唔到3個unknown ga....

Azuma

Originally posted by cutec at 2008-1-18 08:26 AM:
) m1 f( ]; `# f. Y3 q6 Q冇答案ga....
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1 e% ?9 R' r6 a6 @2條equation solve 唔到3個unknown ga....

$ R  [) J4 v$ n; b( |3 R3 t2 M
% E+ S) ^: y9 f1 }4 l! x+ n" ?3 ^0 u% @$ qagree
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  {0 X1 Q# y) I! I! u" @- B3 Y2 equations 2 unknows6 k" t/ ]! Y9 a
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if 3 unknows there should be 3 equations ; ]  m; O" t: T. q& V6 v0 ^

1 _) n$ |- ]. r0 T! o) ~& Z3 e" qmake it simple
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; Y8 X2 {& S9 ]! T6 Q# x! t" gsay % n3 p& _& G: v1 l$ P& c
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a + b +c = 3" p/ M) T( ]7 x
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a+b = 2
3 c- z; w- f8 }( Z# f9 n* U+ Y0 ?3 B% z- X9 d
then c is 1 * ^1 c! p$ E/ L" W$ ]3 H
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a = 2 - b
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so 0 = 0 2 N' r( A# q* z" Q( b3 I

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sakura310

Originally posted by cutec at 2008-1-18 08:26 AM:
6 }' @9 A% ^; I/ W3 o冇答案ga..../ ~1 Z- i+ i" o
) j2 n- C7 y: \3 b; d2 @: h$ z
2條equation solve 唔到3個unknown ga....

# t2 u7 Z1 V9 I% O5 I
+ h9 N8 _0 \3 Q# L  f
此言差矣~1 r, o! {4 f$ V/ A

4 x1 @6 {3 y% V$ p; U0 c' S2條equation solve 唔到3個unknown ga
5 p  W, X. A2 h; J0 D還欠一個條件,就是3條equation都是linear independent(線性無關)的
& }3 ?; @; K6 A, o+ y% _. }  [4 t! a( z9 f# G6 e: H, ]$ @& v
簡單點說,多元一次方程就是線性方程的一個例子
6 G4 _" n" m: s3 i7 c5 u在這情況下,當然是想求n個未知數,至少要用n條線性無關的方程# S9 K9 I5 z8 t) U  R/ ^

- g1 Q% h: s8 E如果不是線性的話,有機會1條方程解3個未知數的(這不是每次都可以的啦~)
) u9 g9 {- b8 K6 q例如 x^2-2(x+8y)+17+4y^2+z^0.5=0 就只有唯一整數解/ }8 s1 A! k2 o7 g; E4 s6 o
有興趣就解解看
0 l6 c7 K2 \, i  Z; U0 X1 t/ |: Y不懂的話就問playplay,佢會知答案

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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3 f  N6 P; m8 z6 @* z

playbr2

Originally posted by sakura310 at  06:47 AM:# A8 c" Z9 \$ h3 }, r- Q6 h
捉錯處就唔敢當
* K3 A' D( A% `不過,c=101n哥度(解...

, @& ^2 ^9 J8 T
" x* p" Y  _5 g" i
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6 a( ^6 O/ X7 H6 z7 A
反而適當地調節一下 , 咁會理性好多
2 i* c. Z/ _  h4 y就好似隻game 由12粒珠 加到13粒珠咁3 G( S4 f7 s- [1 \
當''堂''好玩哂
$ X* {* o& }. |6 I+ W  o! h+ |) j% D& ^
p.s. 求''堂''字正寫

QuiGonJinn

Originally posted by playbr2 at 2008-1-18 14:57:
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! B- a: M4 j8 _! P4 I9 N3 g( Wp.s. 求''堂''字正寫...

. L' W" }6 ^: n" j  R! m已是正寫吧