| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎+ w/ d! L* M. Z

  x( k- Q# B% d9 R8 c1 z/ w(x - a) = x - a5 W7 G, A, H* }4 V1 i! o& R
(x - a) (x - b) = x^2 – ax – bx + ab
* |9 T! V' P( H! k$ \8 ~(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
' \- Q; h' Q& A, L(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
9 Q5 e0 l8 S2 w% s8 l9 t* f如此種推，- p! J& m& P( c- Y
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
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3 ?( x8 S0 _2 [- x* x" O% ?[ Last edited by Triangel on 2007-4-18 at 01:52 PM ]

Triangel

Originally posted by 大大 at 2007-4-18 01:41 PM:) z( @+ _  K9 r$ V- h, h) Y
咁難既=.="5 X* V$ K5 u2 T

' A" ~" m% z  G6 S% a; ^4 L[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

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Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
8 E  y3 X/ c! n9 D  r
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(x-x)= 0 ，所以答案係0，is it?

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- u% i6 h6 Z6 {3 M8 p  VBingo~