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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:$ u k2 y/ I4 ?( R! j5 c) w. V) e3 Z
冇答案ga....8 ?1 h6 ^- r4 t+ u$ u
5 r; f1 _, p2 u0 ~- f, c& n. N* |0 m1 `2條equation solve 唔到3個unknown ga....
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agree 0 f6 R+ Z3 r m3 k! f3 A: M
0 T1 I! c" e7 a+ t3 \) l" B
2 equations 2 unknows
6 A( G( ^* ? x3 w
6 X; i0 E6 m0 c( xif 3 unknows there should be 3 equations . Y h8 g P% n6 S6 {$ j
1 Y' b2 Z$ {) f6 V( i: O
make it simple : Z( j; N9 e4 i# Q. }. |
# ?4 Z5 y% a" j. X. `say 3 F# l" V: j2 S' Q8 p$ ^5 n9 A
% V0 v: v0 W7 y! {" Ua + b +c = 3" ?$ k. {# |0 ~
% ?, ~, z- R% L8 D# [9 h7 H2 g
a+b = 22 N0 y- b% a- [; r: H& i( U; p, D
% l- g6 I+ q4 Y* n c3 _% o
then c is 1
$ i: y: W/ W# a& Q' N: F- w! G# y7 g' y( `4 c
a = 2 - b
k4 L+ @# S7 O- q+ U
2 b3 W& S- o$ O9 f! k% R/ J$ Eso 0 = 0 2 [# L% J* c) K9 b* r/ A
6 m) C9 G. o1 a% X4 z% q
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