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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:
0 K- \1 ~/ H/ I冇答案ga....
7 E( H2 q9 i' B) o5 ?4 A5 F9 {" ?# }' Y% I: m! [
2條equation solve 唔到3個unknown ga....
- K9 U. c4 r( P4 D6 a2 xagree ! M/ r" \2 M1 e1 i$ ~
) A# V2 r- c6 I' ]/ s8 Z8 D6 N; [
2 equations 2 unknows
& J) |$ h: U' B7 P- f, D- m' j9 Q5 A: P* a! {8 w' K! z/ w! L* A
if 3 unknows there should be 3 equations
. k" H0 J# u* d( V. K# ~9 @- d' [
2 a9 T, `( F4 j7 e& zmake it simple
+ Z7 }4 \1 w3 H+ w7 v# k
$ J- ^& g# k- Bsay 4 p! k3 u( t/ r* r+ y2 Q0 S; p/ b
6 L8 h$ W- u. g3 \) K0 t3 K& ea + b +c = 35 r( r& k4 e3 {% o8 Q4 X
$ P9 b- L4 { d; q. F
a+b = 2& M9 ~) v* ]$ M1 P! z4 e: j
. X" z D5 l3 J! ^9 t8 T2 [' }4 r
then c is 1
5 P$ s5 F# P3 q$ k( o, q* T; D7 u0 n, b9 I+ }% t- p8 p
a = 2 - b
; P* E7 V l! Z# Z$ V& a0 X. {, t- z
so 0 = 0 1 f+ Q: |7 ?! E. v+ Y
1 C8 e6 V* _+ G' b |
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