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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:
* w7 n+ f% `; Y" i0 |( i* i. e" ?+ K& }4 i冇答案ga....) t: m6 d- N; l, }
: l U6 A: o2 V5 m5 S2條equation solve 唔到3個unknown ga....
agree ) C4 d! K! V, [: _. j: A
9 q0 m9 q0 f- y( z$ k
2 equations 2 unknows
i3 [; {) U& E8 [! C l( Q" @7 [5 ~ G$ k0 u! {
if 3 unknows there should be 3 equations , e, G- ^) v: b& b9 T" W2 r1 e
9 i0 L: D+ C' R% k, X$ D" w, ?
make it simple
, b$ N- e* p# m
4 U7 M' k5 \6 w, J0 Psay 7 s6 D/ a. i, }8 e3 l2 ]& S
$ t+ C6 P. k% f1 o: R3 X( y
a + b +c = 30 O% ], g8 Q# [% f0 S
$ J2 t, M8 Y' g! ~9 G+ A- x. t! Q. z' ma+b = 22 U6 X \5 I0 u6 V
, y* f0 e, }5 l! T8 K* w _
then c is 1 % n" @9 @* R+ k9 Z
# ?4 }/ ^- e( p1 R1 Ma = 2 - b # u L5 b b6 H2 S3 c3 _ b3 _
+ q3 H0 T, U3 L; l
so 0 = 0
: N8 j/ f1 G+ L. r; k- U
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