| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎$ r4 g' R1 ~; @9 |$ H  b& q2 ~3 q
4 H% c/ F+ q  D0 y
(x - a) = x - a3 R7 O6 m; m& K! D! I! q
(x - a) (x - b) = x^2 – ax – bx + ab; q- X" j* @3 x: g1 _% ^
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc7 x0 I7 I. ~! K" h+ K4 @3 t
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd" z7 O; [. P% i: I7 C
如此種推，
% z7 B6 n# {0 o" r(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
1 W, E0 x2 `# z  U7 n+ [; O( p4 [
[ 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:1 y% D! J+ j7 }. [  l
咁難既=.=". g2 o9 W$ g+ o! T9 I$ N: R* o

' k3 h! f& E' c- O7 |[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

6 ]) F8 Z$ D: |2 H: x1 c) m  m1 F5 I2 [
Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
! S" m, c; b3 h* z( u8 R! Y" U. J
  ~. s; [' x6 f  [! M2 b2 t# `1 F- H' V! t( M
(x-x)= 0 ，所以答案係0，is it?

( a' L/ _( E$ m
/ `% t/ v/ b. ]Bingo~