| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎% K- C5 U" ~. b6 ^& a* V( y

5 f" ^' {$ }2 ^% p/ j9 m3 n/ S1 D(x - a) = x - a- r* W3 \7 C) z0 _- h9 a1 O: f
(x - a) (x - b) = x^2 – ax – bx + ab
1 R' `$ ^  b) }- q(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc) J5 ]" Y( b5 F' R5 R
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
. {% r6 _) e9 L如此種推，- ]/ h+ c! S  V7 G3 a. f  }
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???: G! y2 @/ P# Z4 \! u

- R( u9 Y8 \; k+ H$ D2 i+ h[ Last edited by Triangel on 2007-4-18 at 01:52 PM ]

Triangel

Originally posted by 大大 at 2007-4-18 01:41 PM:4 {" N- F# u5 }" k
咁難既=.="
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" s, S4 }$ H7 [6 \6 D[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

" k$ m) v1 m! ~/ O, |+ D1 E
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Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
6 _; [# z) A1 q8 Y
) G5 F) x: F% A4 J% p* p- t0 e. Z: W+ Z6 Z; p% f5 `  x
(x-x)= 0 ，所以答案係0，is it?

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! y; H5 ^" Q3 }: Q+ fBingo~