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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:( `. G9 R4 z" K# U5 e8 k
冇答案ga....( ]$ j3 Z& h# m8 H
3 i# l" G: q; {6 R, y1 a2條equation solve 唔到3個unknown ga....
& m& O$ |2 D. q- |" [/ f
agree
/ \# {# z# Z+ { C' B; m0 H
5 y$ f6 O' b, U. b; r2 equations 2 unknows! Q% d2 j u# H1 y
3 {9 ]; O# C0 f n I+ l E$ iif 3 unknows there should be 3 equations
4 h1 }* G- W9 \$ l8 ]! T0 _
; N/ J( C3 ?. Q; q3 _make it simple 7 g1 Y, |( w S: D3 I
# U0 a. w# O n( @6 C$ csay
; P7 _% b( S Y; L0 ~9 X" V% o4 u. [/ c) v+ o) U
a + b +c = 3* h: q1 X8 \% c( ]! d
% ]- k% I$ U U2 q4 |/ Aa+b = 2
+ U$ n( ~* I, C5 c: i+ B( n) N# U+ L0 l9 [; W& K: J! z; d& ?
then c is 1 / C7 }4 ^ j& @' k6 v& v$ N3 K
~8 B# p+ @2 z, _- p0 A. f( h" \/ F
a = 2 - b
4 _2 @3 G* S3 w; B) I& ^1 k' V. t; D9 s K( h; m( Q: U
so 0 = 0
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