| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎
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(x - a) = x - a
- h$ r0 F% ?6 Y* D" c7 c  z# k9 L, x1 g(x - a) (x - b) = x^2 – ax – bx + ab; W7 w" u3 {, s! s
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc  O* }/ `0 c3 \8 G
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd
' p" d5 h$ I$ _如此種推，+ f& r7 M4 P5 x% k4 A
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???1 v4 j0 O% s% B

) Q8 g: R. z6 d1 J; Y" K/ ][ 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:* R5 r7 @2 n6 R6 Q
咁難既=.="
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7 C- h, L( C* W2 d[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

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1 \  w# e2 e9 fThanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
+ F5 P. r- z, P: B3 j& k) A' u: a2 h

5 D  C! z+ Y6 z' @5 @( J8 c(x-x)= 0 ，所以答案係0，is it?

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Bingo~