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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:
: c! Y, o6 g- W" `) q1 `冇答案ga....9 o. C/ i8 P, h- i
4 @& o7 A8 `* C5 ^" x% j. H# C5 A2條equation solve 唔到3個unknown ga....
agree , q% U5 d! v8 ?
' U! p0 f4 C) x" E% P, R, V, A
2 equations 2 unknows
4 t' d$ z/ e0 D' }' z6 P& ]8 Q6 G. a' Q; p) d. X5 c; z
if 3 unknows there should be 3 equations # u) E3 a! t6 a) u& S; a1 |" G7 @; U- j
u5 U3 k% W8 [# W; b# kmake it simple
# m9 @5 p+ C7 }" ^; k
0 }/ e {3 {$ Nsay 9 Q( U) `% x1 z0 V) C N
" C( {% u9 |! i$ u2 H4 L+ [5 fa + b +c = 37 I3 }' T5 L7 b( o' Z
* W4 ?$ [+ A+ T* o. C( D3 E: ma+b = 2$ p( p8 u' C* Y4 o1 e; |
; g0 @9 s% K2 }/ K
then c is 1
9 [; I: d$ t6 x; _: l! f
3 C( o0 `# e U! R6 E( B4 X2 I0 za = 2 - b
1 u5 ~4 g! O- H
% `9 D& s7 F4 m) F/ D8 ]6 w. Kso 0 = 0
9 a; B# O1 o/ L
5 \ t" ?/ W, O; R# D" V; S |
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