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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:
. _ I4 {" R1 D8 b. W, e3 e冇答案ga....8 C/ I8 Q6 y, s- \, v
9 T+ ?9 o7 w, T' C9 T
2條equation solve 唔到3個unknown ga....
5 Y# E9 _4 I& {4 g! B+ U! a M- i9 B3 vagree 8 T# |% H# B ~- ? s& K4 L
) b$ N5 j( ~8 D" o0 K5 u$ m
2 equations 2 unknows& o" j- Y0 D' Z/ n. Z9 A) [
5 d6 Z* F0 Y3 ], E3 J5 D
if 3 unknows there should be 3 equations 5 z8 Z. R4 n! u6 c. [. H: d; y5 H
8 S6 e% P0 x8 |) _5 l4 S e* u" g
make it simple ( n9 @* G, l; ]+ K* M
. s: E9 ^& D* f- v) W, u( \, c9 V! J1 Hsay
* J4 B* u: }, {& x. b
: Q; p/ X# {( x/ g, H5 a1 sa + b +c = 34 v! ?7 P% K8 l0 y- F( _
; ~, T$ Z8 o: `: e
a+b = 21 S7 j9 \/ b; U3 z Z l
; q5 Y/ E' ]/ K/ h: f9 c* \then c is 1 0 K9 c& C6 b# R$ \
* H6 i) N" q3 r' Z4 S4 F; {6 \
a = 2 - b
# F: s+ S: l! C$ }' h' H5 r
/ `7 i% j7 M. U1 P& mso 0 = 0 ' `+ O3 W0 f7 p# g/ w( _
/ C) u/ O2 M- m8 C
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