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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: ?8 z& ~! x: ~- F2 _; l, T+ |
% S' V6 L! h/ p& [6 X* F; _(x - a) = x - a* F. d! t2 w3 f M! Q
(x - a) (x - b) = x^2 – ax – bx + ab
- r. v! e; u) @- p" f% g# H5 q(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
) ]. z/ P4 ?" Y5 S* U* ^, Z) j8 o" u(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd: F. J& Z8 H( U" k" K
如此種推,, [; l& h) f: |' U$ h% W6 Y+ g
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
$ f/ H) Z0 u% ?& r6 m" @
6 p0 {2 j- S0 X% K[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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