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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:$ B ]* Z; o( ?& x6 h! d
冇答案ga..... k3 ^& u- T: U* |! \) y( F$ k2 ^# s$ F
2 V2 @- {" l, V4 H/ t
2條equation solve 唔到3個unknown ga....
agree 4 F9 f$ ^9 z# e! p# b* |6 U
+ ?5 ~* O, Z5 r2 equations 2 unknows, B: i1 }# k- X; X5 h4 r# q! I# e
& `! O/ C8 U- ^4 [" O dif 3 unknows there should be 3 equations ) H. Q9 d1 `- ?- y7 c
1 D5 y1 Y- {8 o- D ?# i s- _make it simple
( {. @/ n& z. J: q5 p0 G5 J; K
0 ~, m s1 A. [) X qsay ) A; [ \7 o& U+ L# P2 a( r* @9 b
) p5 y; i; c& \a + b +c = 3
6 _) J- `" S, ~$ H" `) g2 @5 V
) n) [8 e4 _2 t5 D7 ha+b = 2- q* z. `# n* I; a
9 D/ j& X0 V6 L5 |8 E
then c is 1 " J/ ~+ ?# s; t4 v
/ A) g' R, Y. ^" }a = 2 - b " ^6 [7 U5 x; @( ]" z0 N
' h; x8 u0 G% J/ w7 k
so 0 = 0 * g5 j. O% w: a) `
5 H a& k; ]) `, M* v7 z5 _7 Z5 Y |
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