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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:
0 G' n. L% L) G& s( k+ i- z4 a冇答案ga....4 d4 s) _8 ~! d) |* v
6 ]8 y. F: ^9 ]1 B2條equation solve 唔到3個unknown ga....
' e6 z9 G+ v! C) D; b8 a6 g
agree
" M& d) G& U- ~1 C( {$ m0 E$ C: ~/ e# n7 _7 G7 j
2 equations 2 unknows! Q5 N7 V) [/ f
/ J) h" p" q6 V/ Y$ S; Q1 U
if 3 unknows there should be 3 equations 2 G9 s1 n' V6 q% X, ^, G$ j
* ^1 U0 J. Y" b+ A* {* |/ Lmake it simple 9 j: p7 ?, P3 f2 I7 d, I3 v8 P- m
2 D, r7 _2 t, v7 A2 |, ?9 U- esay
z+ ?2 ?% [8 G" Q% {$ r% F
9 B3 z& t2 Q! w) a; F* i4 k; ba + b +c = 3
* E1 {- K# _4 m& w6 `; }+ p$ W
& M% [! Q9 V0 T' Ya+b = 2
9 v/ l) _' `9 E6 C
$ y; r% e) |; Tthen c is 1
& T% c' e L& G9 L: b
1 H: i5 W! S& M h" n A% F/ Wa = 2 - b
2 b0 a& o0 Z( Z9 Y! f% U* D2 J3 `/ c+ ^7 M( P z
so 0 = 0 $ ?' P0 i+ H3 z; P
N/ x1 j7 u9 p* R% b |
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