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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:
* L0 F4 O. Q" m h7 h, u: k& E9 U冇答案ga....6 t" U4 L7 I5 ?
3 y4 P% y5 y3 e+ Q2 R2條equation solve 唔到3個unknown ga....
" o8 v/ Z2 E( u4 Xagree & A9 n7 G2 ~; e2 _5 I* L
8 P3 E% d- s" S; w" d
2 equations 2 unknows+ _3 W4 ?( c* A O& P3 C$ @
, |0 G/ H2 P3 \ `# b& \. Y% F, K
if 3 unknows there should be 3 equations ' t9 D# t+ H0 L C2 H
" z) k1 N+ @2 T! e. K/ I X
make it simple & m. E- I$ O1 P/ \% T
0 ^( Y1 n4 E$ F2 {
say 6 L1 i# [" s4 n% d8 b
/ x' \( |% B" t+ }7 ^0 ba + b +c = 3
' y1 f j- n- z
& O6 t1 ]) s" a9 b* l1 a6 ~a+b = 2' H5 [ B. ~7 k5 ?) x5 U
9 Y0 l4 C% f' N( r: z: O
then c is 1
" d6 C' |9 c6 z5 Y5 U4 g6 u4 x. Z- k% X; b6 \
a = 2 - b
; O$ Y* k6 |2 C K; r
5 c( I1 V k: ?" X& V- {. E" jso 0 = 0
$ L3 M6 ~+ |: o; v0 J: z) F1 O
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