Azuma

Originally posted by cutec at 2008-1-18 08:26 AM:# i. `' V8 k- I" t& v
冇答案ga....& ~9 r5 k, V9 C: L- O( F& W

, ^6 o" h) N* n4 v0 x, m; \2條equation solve 唔到3個unknown ga....

+ s- a9 F* z, @1 y4 H
: D) v/ {' r6 wagree 3 S+ p2 A$ n  o: S
' I# S4 J8 ]6 e5 c7 M4 |4 g; _
2 equations 2 unknows
1 }! A$ _* @  T: C2 J7 Q" q2 F
+ L) G% s, q: ^3 Y- d$ q. ^' E" sif 3 unknows there should be 3 equations . \7 q' Q( Q3 h5 O% q3 j9 A
- i# o$ s" \$ K+ T. a% u
make it simple
1 @+ _5 B) Y/ P9 u* A3 h8 |1 {; C- I+ v5 b1 |% h1 a
say 1 T, c* O9 G% }% E& z- X, Z

2 c. [' N1 c  V8 \4 e! P+ |* U( Ua + b +c = 3
4 e3 @" `3 j4 w: Y
# O$ c) p. F# U; Da+b = 20 a4 \+ F2 w) q/ R+ E. w& Y8 B
1 W- e" Y- {5 u( K2 M, @/ `9 H1 N
then c is 1 & `+ e& l% C: I3 n0 X
7 K* x5 _# Z' _8 l
a = 2 - b
! P9 G' g  }1 S4 ^" p. B
) R* x% Y$ R. u2 Z, P+ A% \so 0 = 0
- r( X* \" I; }' Y! R
! L: m- y) m0 A: p