| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎
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(x - a) = x - a
0 ~% N7 @1 f# T. S: |+ `6 \8 O(x - a) (x - b) = x^2 – ax – bx + ab/ |1 D3 W' r! e# _! }
(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc) {/ m7 Y8 N- T* ]3 ~& [3 ]
(x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd2 q5 t' m& L9 k- `* A
如此種推，
( q5 s# d' A2 v7 u(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???8 y7 Q4 t" |0 Y
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[ 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:! R; `6 V$ M' d1 U3 h2 V
咁難既=.="
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[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

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7 ^2 C( o1 _4 F- P3 T- F7 O5 [Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:
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( c  c- A+ ?7 q/ E, [' O(x-x)= 0 ，所以答案係0，is it?

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Bingo~