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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:7 o T$ t+ d5 u# z- g2 |
冇答案ga....# [- C% e, Q! _3 k" z, q9 B
' g1 A) n3 q8 j/ p2條equation solve 唔到3個unknown ga....
: ]7 Q" W, s, g; w1 _* m) | I5 yagree
9 u# ]9 f7 _9 R' Z9 A5 T( F/ L, y0 p. X
2 equations 2 unknows
) h3 t0 d8 h- H b% w/ C6 o( j3 Y/ a$ L, ?* q }9 Z; P
if 3 unknows there should be 3 equations
7 { p4 P0 d" {% I( B( I( Q) E9 @+ ~+ e0 Y6 U& C7 S0 K
make it simple $ P3 y2 `8 g! _1 S5 E3 D
, F, G3 E% S5 H8 j; G$ m' a- M
say
5 ?& Y3 C+ o9 |: M* u: V% r% a- c) u7 q; ^/ K0 j- Z. K
a + b +c = 3
+ q8 s2 j! Y& I3 [4 l6 j( K
/ G6 S+ e9 A8 k* h, v* }a+b = 2
& h7 K h" ~1 U1 x! m
: w& r4 E$ B4 c# w1 }0 p5 Nthen c is 1
: B8 s+ [& y, T
1 T" D+ x* B" V2 S1 a* N R: |a = 2 - b
4 E* D: D- G ~# q
1 k8 W! i8 q5 V8 t) T! \so 0 = 0
7 b, ?) T; u2 d1 [; n$ x* F' h' f) r& U- y4 H, r8 G
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