| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎
3 N' S$ e+ I$ `! L0 X( f5 S* W( l5 H( F
(x - a) = x - a
2 f9 c$ \% P$ @$ R  Y# E& _(x - a) (x - b) = x^2 – ax – bx + ab! k6 B+ I! {  D$ g2 q  ]
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc& C: F8 |3 }- G3 T% x# N7 V
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd* z. f: D$ |* r$ k) s0 ]7 C8 k
如此種推，
9 ^9 e5 ]4 k5 K! D6 P! x(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???' C, s# a, W& {% j3 l

* g+ K! Y9 _' @9 s/ |, b[ 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:
# {( K: _. R& Y# W: _" z2 E4 q( s6 t咁難既=.="- B& t5 U* v8 U9 C, p5 Q
- s" c% o' Q' v) }" l  y
[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

5 q' q+ [1 Q1 Z3 `" L# `$ M( D$ N8 \
$ c/ U5 v. w2 T0 e
Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:, y4 v' ^0 F* j2 Q1 H3 e; d7 e3 m; S0 }

. k: q) Y5 i/ M+ b  F6 ^* \# e3 m9 `2 |+ ~- Y
(x-x)= 0 ，所以答案係0，is it?

7 g4 }' ]- `+ O' x$ v+ n. m
0 q+ P( X  q' i7 R
Bingo~