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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:
, R6 r% p7 Q, k6 U冇答案ga.... E0 H- R' c; C% t6 v% e
\ D1 r" ~! _2條equation solve 唔到3個unknown ga....
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agree 2 l. O' \2 l6 [
: Q6 q5 K i+ O+ `4 h
2 equations 2 unknows7 K! I T6 o1 A, @8 j% b+ T1 \5 H
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if 3 unknows there should be 3 equations
/ g. w( D. R, ]! _# i' T, H' {
! b# d% f* i+ k; e% K8 Mmake it simple
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say 8 Y# I' o5 c% z0 u4 i c
2 F8 N' u/ U, N! ?a + b +c = 3. S$ `2 g) w6 l) ~) [, H- H" r
8 g5 [/ r5 m% j8 L: x
a+b = 2$ a* P5 a! P I
3 \, a G, x* nthen c is 1
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a = 2 - b
! ^# @& U. B- s, f% l# Q2 k B, m- w4 K3 X. j' B
so 0 = 0
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