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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:3 r' S' Y7 C% m8 H, E" `- M
冇答案ga....5 k6 }) L; t7 I$ Q( F/ d' H! V l
. T2 h& l- A: S4 t2條equation solve 唔到3個unknown ga....
* g2 f/ [0 Z% C; l5 E5 E! xagree
: G0 A; u, V3 n) O" W4 Z* u2 a$ U/ h8 S5 U2 u/ r. e
2 equations 2 unknows
, b) J( }* J$ E0 \9 f/ K5 b
" L5 A; k. j" M. Q% Z; Mif 3 unknows there should be 3 equations ) f$ Z+ l2 B, \
7 Y9 a9 t0 k, ]" `$ Umake it simple
7 ]0 n3 |. a7 A. R; ]# ]( x5 [
# n( l! W# J/ O! n, ~0 R- @say % C2 q& j5 e( ?/ A
: M) r2 S1 B" B* ?a + b +c = 3
7 C0 p5 l$ F5 ^
6 ~* G# U1 {% }8 I, n }3 K2 }a+b = 2
2 W) S- ]2 U4 |' z
) q# `# t3 G$ Uthen c is 1
( X+ x4 X( s% L. C1 N! X5 a& {7 \1 Q
a = 2 - b * N2 }9 l, D& ~+ a# }0 s
: B1 B* R6 `2 r9 a7 S# Q) F4 L
so 0 = 0
' q8 P2 b3 \( `0 m
) x, s( x6 l! U& R |
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