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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% O. A' H3 k! ^8 w
" l& c0 r0 U, d+ r% U* ^* ~
(x - a) = x - a
: A1 e" d: }+ }9 G0 G8 z, A(x - a) (x - b) = x^2 – ax – bx + ab8 e; c$ H9 C$ k" o
(x - a) (x - b) (x – c) = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc: S; V/ n6 e' i. H1 Z, Q0 { b2 k& `
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd) l6 Y5 {6 A6 \9 h0 [/ m" b. I
如此種推,
( p4 {6 f7 w% g. O' }(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???3 _1 Z, [2 k8 b+ q
2 n( r! Y9 Q% i5 G+ Z[ Last edited by Triangel on 2007-4-18 at 01:52 PM ] |
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