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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
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(x - a) = x - a
K5 P, i, ~% }(x - a) (x - b) = x^2 – ax – bx + ab, `( C0 z# y v4 w; b! d. t+ r
(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
3 `( W' ]4 ?& v/ I. ]8 |' }+ x(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd& h f/ T1 w5 S6 K
如此種推,
7 C& g4 ~+ d7 j4 B5 J* Q7 j(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
7 d1 f9 Q @8 T% C
4 N# t. \) \7 f* P% J. W% b1 g5 U[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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