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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1 }6 ^7 u/ h2 `, ~4 Y6 d, w
$ N9 m; `% N4 L+ m4 K' k% \; x: r9 v(x - a) = x - a' l% I% ?1 Z1 I4 M& k: V
(x - a) (x - b) = x^2 – ax – bx + ab
( R$ N6 Y( Y1 b4 s8 U8 B/ C: e(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc8 r: ]9 b8 B# l6 J
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd1 |/ H; j+ z6 W3 x
如此種推,
- p' w) s* K+ J" P# D4 M2 w0 ?(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???" c# I+ [4 X- Q7 R+ F/ s
5 V, K# m* B5 f$ ^$ {2 L
[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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