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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:' d- D( v- n; |3 O
冇答案ga....9 \6 U/ Y" m* g
+ M2 \9 t) P9 P; j( t ]( Q$ q2 ?
2條equation solve 唔到3個unknown ga....
7 U: d5 ?4 y( Vagree : }6 O7 e' w4 U2 i% i% U: {
- f' b. b# ^' ?7 ~2 equations 2 unknows) c. B) l* j' R, M
+ o* c; W# F4 \; {7 T& I4 i* a
if 3 unknows there should be 3 equations ) s5 d) k7 c, C+ D. U3 l. o4 J
5 d# ^4 [/ j1 {& G- E+ s# g' J% i9 a
make it simple ?1 k n& M0 |$ U
% v) i* J* n6 K+ Hsay
w/ }$ o; H7 V- ~# }, h6 T3 j- F: O9 p' H
a + b +c = 3
' ~! v1 F& A& F C3 J8 h
% [+ g4 O9 F! @& u- ~a+b = 2
7 s: D3 D$ n* }3 v1 W% J! L; } D9 A, @3 q9 S
then c is 1
' x6 }* H. ^! [7 \
4 I. [/ V; y, ^! o+ ha = 2 - b ! W5 f3 G) R( a* r: @8 C" O" I$ ]
N. J9 r& p' E- \+ `# Y
so 0 = 0
7 y3 b! ]0 \* Z- l
, S# k$ c t; P% k |
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