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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:
6 X/ w: M) _; z: R. }冇答案ga....
, z- ]% p. q. ]( X Z( ]1 X& i
- O, a" O3 e' Y' u2條equation solve 唔到3個unknown ga....
agree & j% G0 p/ V" G/ N1 x3 p1 A
: V. H$ R- B6 \2 equations 2 unknows
: \& m7 C5 w" E+ n5 |! s" B/ c( [! d3 k- \4 C6 L1 B
if 3 unknows there should be 3 equations
/ b/ {, ^" J/ I
' _- ?% m$ U: ^/ W9 g& b7 M5 Q3 dmake it simple
" F$ `7 J9 N; e
* d: \$ e/ {4 N4 c. `say b. q8 x/ |( J. {1 K2 J
; ^4 V- Z1 e% w& O3 B5 f$ _- G
a + b +c = 3/ t, E9 t& p: G+ B" }. J
" ]0 |2 o: C, G0 a3 M3 ra+b = 2- O$ w4 Q4 E6 P2 H0 ^: Q6 n6 r4 F# q& B
/ N% Y; l* D9 s( y
then c is 1 ' I: Q; b* E P9 r! G5 v
# m* ^) Y' ]8 B2 b) e% v, Ga = 2 - b
# w# v" T; u0 D9 O% o+ |3 a/ g; x* ^8 @
so 0 = 0 . L. O8 v" u6 y7 @) }
% n/ U6 U! F0 c) q$ M# M |
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