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發表於 2007-4-18 01:26 PM
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| TriTri | A-Math 加分題 |
第一個答中有獎
. w, k+ T0 A- j6 v1 V$ X
U4 o* c7 h C$ q2 W& n& R7 h(x - a) = x - a
, Y* s- V. P* C; k( U( ^(x - a) (x - b) = x^2 – ax – bx + ab
% C4 P$ S g/ \9 f& Z0 N(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc$ x+ d4 J, K8 D# R0 X) L1 X
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
8 u$ M' X4 g# F5 U; m" u4 W如此種推,
) }: w5 F* ?: H7 ^" A. |4 X(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
2 h! f3 }2 v- p" Z* {$ O1 \1 _$ t( S- G1 ?/ @/ ?( Q
[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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