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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 G; h' _' o# }% {3 \$ [9 n! K
冇答案ga....* g/ z8 @) S$ W& |: x% u1 g; |
4 b9 }2 }/ e6 r1 b6 y" v2條equation solve 唔到3個unknown ga....
7 d) j( |1 p8 X
agree " T; y. ] W- H: i# P- V; B
/ y2 y. m( c% G# e4 q c4 Q
2 equations 2 unknows) t& [- N' ]+ o, Z2 f
: R& A7 {% b, q% t M: v$ D# {8 W9 a
if 3 unknows there should be 3 equations $ Y' N! t4 N X: V
) ] i' U& i3 t' Y9 Dmake it simple
# ^: D: }+ b" G0 A7 X2 X- ?4 s' e
say
+ Q! x& Z/ \9 e" x6 {* B0 Z, S8 x* U: ]& V1 D5 D9 C
a + b +c = 33 ` F- U' h @. r( S' v( H
' i% G3 _3 G1 ]
a+b = 2
1 S: W! a, I' I0 U" M& ^: A Y0 i' M& @7 i4 _8 D* e8 O0 t
then c is 1
; ^' s5 l+ Q, k/ F& b( n8 p H( q
7 X5 ~* q% e ~- R' za = 2 - b
! T! ~0 ~2 Y5 B! V3 g: ?6 p; S0 V( E X" U' p: _/ [6 b
so 0 = 0
5 j8 ]/ l& W6 c J* H9 j2 |& Q- G$ a3 f9 r
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