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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:
1 d0 C7 C6 t, V0 k$ k冇答案ga....( L2 `1 v& T0 F4 s2 d
) m1 s( y$ W5 R5 c( |5 D7 T/ B1 v% |2條equation solve 唔到3個unknown ga....
agree
' y/ b6 r9 e. {7 L' q0 E, h6 w9 M& |
2 equations 2 unknows
% M9 F+ [( |/ \! \3 a5 O, R7 o0 a; l! [1 A( ]9 T
if 3 unknows there should be 3 equations
3 d0 [: s) w5 x" c
/ y C6 |. q. j% t# _make it simple
8 O' y$ j: I; _. p7 ]
! y/ f* _ p+ ]# p' N: n- n ~say & r0 k! v+ F6 l7 ? {
$ A) s3 F T/ }/ I! ]: c
a + b +c = 3
8 _/ k8 w0 E% p7 D& A' m: ]# F6 Z4 [8 y5 Y' W n% t2 T
a+b = 2% Q2 w3 J9 R, ~: {9 [
6 d1 N, r8 i6 n5 pthen c is 1 % j; y7 \" e. T& }5 n0 B' }
: n3 l: U9 M% h0 d
a = 2 - b
7 e& F9 \# k. O1 X6 Z" N" V* Q* d! p. b
so 0 = 0 : s3 S( ^. x) r$ i' q" U) h% x5 c& t# T
. v9 S- S- z7 E- k `1 r; } |
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