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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:
* F/ A7 V$ m- \' v5 ?/ \, V冇答案ga....
$ n2 ~' K# D5 Z
3 K4 h" F& l/ \+ v2條equation solve 唔到3個unknown ga....
: _6 t, k6 U* ^agree + M; u4 Z+ N- w; `) P
2 F2 Z: M& C8 [! r3 A* i1 B
2 equations 2 unknows. q" s6 ~! T' O5 O9 X2 z
( c7 C/ m; m) {4 a0 Kif 3 unknows there should be 3 equations 0 t( F' e/ [+ X
3 w3 i$ _9 r* u! X% ]8 O2 m4 ~" jmake it simple & }6 H1 T k& {7 h; A9 e" ?1 |
$ y' a& d; e- P- p6 J$ G0 J
say
7 d8 J, `# b! k c0 n& l
+ f4 r" d9 X% @1 Fa + b +c = 3
+ Q0 a- C% v- I5 ~/ j
! a5 J' E. \8 n# Fa+b = 2
7 J8 X+ T2 B5 d( T/ f8 h: p" u0 V' s3 s) I* U5 S' P
then c is 1
6 y" c5 I2 G0 d- [5 V9 D9 u; W
6 j0 a8 h+ c' `' Z" M% _5 V4 |8 Na = 2 - b
2 Y* H* b; c2 _7 S1 k7 U9 h$ ]0 j
+ g0 M0 e. B H$ }6 H' e: P$ Cso 0 = 0 ! z( i( ?, `! ]9 `. v# X
1 \8 F3 j% [9 C, }- m
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