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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:
1 s+ V/ X ^+ W. H" O; }$ p冇答案ga....
8 F/ E0 z& Q# `) P+ l1 ]) D& n
9 X" B; w+ S( f9 U2條equation solve 唔到3個unknown ga....
! w6 T9 Y Z7 k6 W9 e bagree & p" k* U. O: o# D9 j
& S) y! ?* M& X) O: o7 ?
2 equations 2 unknows. {( O1 b4 z* |" P
) {; U" l- }: ~, V q5 r9 Qif 3 unknows there should be 3 equations + y# i# T1 J& F2 Z
, B# I! c9 c) L) x: |+ s6 Kmake it simple
3 L% M; M J( L( b: f. o5 |( a' k5 I" w1 {$ @; }. }) _6 }& R
say
2 r$ U- P$ S3 j9 f* H. e- U2 b/ J! K0 ?+ E, u, ]; ?
a + b +c = 35 z% a: K, {2 h: A& f5 R
: W3 E E3 m" J8 _( g0 _& ^5 j* J9 ta+b = 2
7 r9 m$ V' \* a0 C
5 ?/ S; L; b2 tthen c is 1
+ F. L: Y7 r% W/ O( X4 g
! h; |. R( g, n, p1 E; ?a = 2 - b 1 S \" R- Q3 u7 m, V& Y1 M% j" x
3 i7 m- h! V( P P8 b% n/ {
so 0 = 0 " A3 }6 s( g( e
0 J2 l: S1 g: c$ C# _. O |
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