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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. w0 V' C, A I5 n4 _ Y
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(x - a) = x - a
I, S2 t+ T* }( \0 g(x - a) (x - b) = x^2 – ax – bx + ab* S$ w P8 G1 J5 m9 W
(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc5 Y4 Y! `& ~0 Z8 }# L$ e" H8 B N
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd& `% M$ G; l5 T: W. y+ J' {4 w
如此種推,
* U3 j" P) L( r) B' ?& v(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
9 D7 ^2 i- E i' i" c5 O, K
# X9 D+ v6 ]# L( q0 ]$ b" G' j" _[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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