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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, q# H+ k7 J' d1 e8 j
4 n C0 [' z2 Z' K, S% T/ W$ f(x - a) = x - a- ?( r# o$ }7 ]0 t. V/ w7 [
(x - a) (x - b) = x^2 – ax – bx + ab
f2 E* B4 [; o8 z6 ~(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc; q" Y% D: m& v, i) u6 E
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd7 l+ l) ?6 b! E8 d, `& N
如此種推,
* G2 a( }+ C/ O, s9 ?+ |(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???9 c' m5 M$ e8 n$ z
& j' A2 \9 f- r a5 _7 S' k[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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