| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎1 r! J' I$ @, f6 p) h- E  F+ J' N

7 t  |2 h$ K) @; S  z' ]8 \(x - a) = x - a
+ m8 U! h' g3 {2 x. b(x - a) (x - b) = x^2 – ax – bx + ab5 M6 X8 [* k! x4 ^, s5 h3 X8 i% g
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
5 S. W6 ]6 W& s3 m(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
) I$ G9 ^% N5 G9 T% u7 z- G如此種推，
/ a( b1 D, y3 X$ @(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
* O  J% K$ [0 F, `8 U, f* Q
3 r3 W; I8 r; r+ o" ~) x[ 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:
4 f/ Z! h1 s% @: C6 Q6 [7 }0 b咁難既=.="6 `# g; [1 v( t  n4 z

  Y* K" G* X7 x  F, e[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

, K4 v/ b+ e! s# |9 V% b: g+ W. X
Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
5 n; e" S# o# U5 ?3 o' {4 Q4 [# p! X8 R- B6 Q
$ _" |8 m" ^6 j2 f- K
(x-x)= 0 ，所以答案係0，is it?

! T1 y( N# j4 k4 z0 B! p) N' H5 ?6 L$ M- N! F
Bingo~