| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎
( ?0 ]# p$ ]! ]. \& L' E  o. T8 y; u% t1 B' ^3 w, s1 c
(x - a) = x - a7 g# L3 M# k/ ?4 O; _
(x - a) (x - b) = x^2 – ax – bx + ab$ S/ S% S, z- {" b$ t* l6 a$ w
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
% ]& O2 s0 @8 d( ?) K8 P4 w8 `(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
' F, h: A+ m" L9 p如此種推，
# F# I: @2 `" s. a+ V3 I8 e(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
; {$ _4 a) V- q  W( Y
' W) W# _* r7 J3 G3 y' C- [; O[ 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:% h4 t7 X" A, r0 F! N" T
咁難既=.="
' ^. x3 {$ [# t% y: ^- @
! k( K. p2 ?/ n3 b4 W& l2 H[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

# Y- t% i/ b$ ?# k# w. C
$ C  |! p; E7 z/ ~Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:9 Q- d; J) e6 K, p  D0 v( G. Q

/ L: Q/ D' ^, r7 ~4 B- m- v4 Q0 T$ s+ B" D" z  V
(x-x)= 0 ，所以答案係0，is it?

+ ]* E" f/ O3 q+ a/ K# B+ H

; l- {- ]( B0 a! Q+ FBingo~