| TriTri | A-Math 加分題 |

Triangel

第一個答中有獎2 {  M7 l% J1 |2 R

! p3 Z/ `! R; e: w(x - a) = x - a" r+ l: c8 {0 Q+ p) I/ `
(x - a) (x - b) = x^2 – ax – bx + ab
$ n! _! x; q. }# z) S8 l9 X(x - a) (x - b) (x – c) =  x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc
! i9 O# q1 E& r/ L4 [, t2 U- J( ](x - a) (x - b) (x – c) (x - d) = x^4 – ax^3 – bx^3 – cx^3 – abx^2……………….. +abcd2 M8 ?" Q; Q( J4 w, ]+ E! Y
如此種推，& J8 V/ L8 f$ U, _2 T8 G$ o/ B7 g7 C
(x-a) (x-b) (x-c) (x-d) (x-e)……..(x-z) = ???
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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:
0 {0 k9 Q5 b. k( @& [咁難既=.="
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9 |/ }+ J8 C3 ?3 Y% j) n4 k# W[ Last edited by 大大 on 2007-4-18 at 01:52 PM ]

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Thanks! 更正啦

Triangel

Originally posted by littlenic at 2007-4-18 01:54 PM:. p. \1 C( G) `! o- z% {& F! F
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& z2 ?/ F( n5 T2 e5 l; h% b/ o
(x-x)= 0 ，所以答案係0，is it?

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1 p4 j6 h8 Q' ]0 [+ |1 m- R% Y3 b
Bingo~