| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎0 K6 O% ]( m$ m. p% j

. C# }5 h1 j* w(x - a) = x - a" c! C! I6 p; i3 V+ c0 Z9 m( t
(x - a) (x - b) = x^2 – ax – bx + ab
6 W. O2 m/ k3 x. K  I3 S" q(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc: t4 }( d% ~- I- {) f; _7 d# G( Y
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd! @" F* v2 r: F; V; H% p
如此種推，( T6 {. h3 [! E0 v3 [7 N7 |
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???# b0 y9 S1 W) l+ H' {

/ r6 t7 Q! e- C5 x7 v* M[ 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:
! c% F. f/ w( a3 W. {咁難既=.="
8 W6 ~6 }! v" p( {) n
* K: y$ l5 Z4 \0 C" `[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

( \# w* J8 O/ s' n3 `1 d+ }# g- B9 ~7 Q% P4 d
Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
4 Q, O7 `/ z8 {" T4 G. E+ C  D0 Q; l. b- C; [6 s1 j$ r
- V( U& {2 T# `  a& U
(x-x)= 0 ，所以答案係0，is it?

  f& B% H6 F( P$ Y$ I
( T5 Q+ w8 V5 o) s- {% TBingo~