| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎4 M$ b8 o; g8 \0 o8 G( g

- t  ]) a6 p* _# y/ H- Z(x - a) = x - a
/ @  ~. O+ a% y/ w% D(x - a) (x - b) = x^2 – ax – bx + ab
* P# e) `; @. x9 ^(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc( g. ^9 q* C/ t: h
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd4 q% N6 A# E4 ~1 O  t" a& k* q
如此種推，3 |/ @+ x8 {: G5 M, L
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
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9 ]4 B0 j, x3 H6 `; D- t; H$ s[ 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:
6 g, w0 }, c* E& [咁難既=.="
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[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

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! o- F+ v- g  C4 _Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:  b- a& v2 X' ^2 t0 z
0 M* S8 m% }& |
3 B( |7 o, y4 t8 @( p
(x-x)= 0 ，所以答案係0，is it?

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Bingo~