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1#
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# A' b$ v+ z8 k- f$ S
* J6 {5 X# z+ ^4 a3 } A(x - a) = x - a
* J# j2 D, u# w3 W(x - a) (x - b) = x^2 – ax – bx + ab
9 N+ B" r7 A( {) ]" F& h(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc: G6 }6 R9 A1 v6 H, k4 O
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd8 F3 k' a. z! _) v2 _/ I" |/ C+ C
如此種推,
5 _6 S5 Q5 q$ W$ j1 W(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???( Z- `) \) x& A8 V1 B
; y5 _ Y9 w1 w, N$ T[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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