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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 Y* @& v* D8 [& `
冇答案ga....* h R- k) D; S7 s6 k
/ a4 d8 z$ C# Y; O6 F' a( P
2條equation solve 唔到3個unknown ga....
agree
9 }9 ?, b. V3 s
1 G7 j7 C# Q: b- K4 U+ x7 [5 p2 equations 2 unknows% b' U; s# c: L8 u
& T8 P0 g ]! m3 b& ~& X
if 3 unknows there should be 3 equations
" s' Z3 k4 M* n6 X+ m4 d ]- F& R2 j" T7 q) b ^: p, d
make it simple
; b+ f3 Y( f% N/ @2 _* |0 i! L
4 e! r5 D7 B+ t1 tsay
. a. l, F6 O# q" n1 W" ^- ~
8 i8 }2 k4 c5 wa + b +c = 3+ {4 N; }! c6 V. x
4 b" `! a! L6 \) a5 {. z4 Y: qa+b = 2" _, Q& P! y. Z0 B) [& Q
* v/ x* K a) K. ^' w( ?0 @% Q4 {( @then c is 1
- s7 \ U- o3 `% b8 N% I% r; M) g/ C2 {5 \! t" x8 n: J
a = 2 - b
7 R: _" z4 }9 _$ Y! T" u( K3 g( W( w- u8 M
so 0 = 0 $ `: X# Q, G, |$ ^, _& w3 U
4 j+ S% N$ S# a& L# Q
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