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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:( a" A: G2 m! i9 E U1 g
冇答案ga....
* r$ o5 F1 X Y! S
$ W. U8 T _& }* y3 q& D; @2條equation solve 唔到3個unknown ga....
agree
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' ^/ M3 D: i. y L6 w: X2 equations 2 unknows
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" I' Q7 |8 c2 t- Y3 v* j; [$ Xif 3 unknows there should be 3 equations
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1 Z' G5 s1 x1 Z& T4 ~make it simple
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: W" T& P4 M- |* x6 c/ [say : _9 C' t! ]5 N! d0 |6 ^& [# O" g2 \
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a + b +c = 3
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9 S" R1 k! E: x5 l/ \a+b = 2* u1 @$ r6 k2 y( y6 E6 K; k0 u; \
2 j2 v% P j" v @8 n, _, F5 o9 othen c is 1 / O" n" z: o4 \& ~/ x# t6 ?5 J
8 e4 F& J4 |* h1 q. x7 N+ j( ja = 2 - b
- l1 x: x. _4 p, h* E3 I& ` Q5 u# a# f- |3 V
so 0 = 0
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