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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:( Z, P, C5 m. T7 D' z) A7 D
冇答案ga..../ C$ M8 `) ^" B
# Q/ \+ ~- a$ s0 U# |7 h, r
2條equation solve 唔到3個unknown ga....
agree ! K( b* p* U. W9 P9 J$ a3 P4 }
6 ?$ Z7 S+ O& R2 W( c2 equations 2 unknows: E3 O6 B$ }, l7 n: [
$ Q- T7 ?& P9 s$ Y8 ] s( E) m* ~
if 3 unknows there should be 3 equations
$ j1 i& m! i+ h* X" A. C( o3 e
make it simple ; t! x0 }8 Q& K$ [
`8 Y0 c' D7 ^+ Qsay
- X( `" u- o: f5 X, J+ f$ Y8 q0 f7 f
a + b +c = 3/ p# ?# Y* a5 B) c: s# Y
/ R( g3 S( L/ D3 J7 l: La+b = 2, f+ V% u! ~' b6 @/ O2 h6 v0 n/ M
( c6 Q& h0 ~2 {! V8 c/ R+ D
then c is 1 % H' v% ~/ F- [: k. I
! [8 e+ s2 F$ Ga = 2 - b & Y7 {) x+ d) t+ d
2 \8 S8 `5 K5 b5 {
so 0 = 0
V" s: S0 c/ Y) q% b1 u$ _; j5 H/ B# Q. n' y8 v& c- `/ A
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