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發表於 2008-1-18 08:56 AM
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Originally posted by cutec at 2008-1-18 08:26 AM:& r& z9 C3 ^$ i& `8 X) I
冇答案ga....
7 A8 z, j6 O2 N; Z! J
, T. Y9 A% f: ]0 z2條equation solve 唔到3個unknown ga....
- V# d" P6 b! C% H- }
agree , V) N% m' G; E3 O. P* m/ e; e
+ g$ D. ^9 S- \! D, _
2 equations 2 unknows6 d. q' o1 h9 a: l, p8 d
' J1 W3 `: t! Z7 [0 f, N' { h. V
if 3 unknows there should be 3 equations 9 M, ^7 Q' K* L: a4 O
% x3 H. R+ Z' R1 Y$ n
make it simple % W$ a$ ]8 C. d2 G/ p6 U% T1 Z
8 k+ ?5 d7 y& j8 `say
5 { O4 r# n1 s! y
8 B9 ]7 D+ s* l6 o5 Ba + b +c = 3
. H5 D1 t) i; H+ H/ `% u
5 `& h" W9 n2 O4 pa+b = 2( x# K, I$ Q4 f. z' S7 A5 R
* \" B' l9 b) _/ j+ P2 p. o) C" `
then c is 1
5 |8 {; n& P7 l& u+ i- B: I
/ p" | ?( L. g7 \a = 2 - b ! ~, I( T3 O5 U
9 M2 S7 O+ @5 v( ~7 z' @/ M3 V$ D
so 0 = 0 1 [( U: x2 y' k( }! u& s' [ p
- G' R+ ^+ I* J" ~% e( Y! x |
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