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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:9 G! |+ k/ L, z
冇答案ga....
$ n" o/ ]- s( i6 C9 n1 P, g# ], \- {; C: G( y% G1 |3 g
2條equation solve 唔到3個unknown ga....
* i5 r& u. A c7 p
agree - A) Y: f! [* K, [" [2 k: ]
, o/ V' Z, \$ w. L# U
2 equations 2 unknows
! \/ \/ O2 J7 K* J% f- j. ^; f7 u/ w# p, `+ E0 n+ ?
if 3 unknows there should be 3 equations
; P3 y" \6 @( d2 R* y
* }& k7 l: N/ e5 M7 Zmake it simple $ q9 }5 |" D2 t- s* \
0 Y' P4 t4 T* s' P( J( [+ f% b
say ! @2 x0 l: T/ b0 q. @1 u1 U
: r! X+ ~8 t. J' J. ]: Ka + b +c = 3
q' @" h/ E, d* n! L: S7 v6 _! H% d x5 E0 k
a+b = 2
, L+ t$ M; @% b' o* s2 S! J3 Q- ]1 P1 e9 {2 V/ Q Q d. a
then c is 1
6 |. e) y' _9 O! d! u, \9 _4 ]# h) f) j5 f& U# g/ P5 ]' H
a = 2 - b ) g: V7 G0 N6 l% }" z" L8 ^
$ L8 W1 f8 g$ r Zso 0 = 0
. h- m3 |- j" J6 s# e, e+ B4 Q. U# v
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