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» | TriTri | A-Math 加分題 |
Triangel
發表於 2007-4-18 01:26 PM
| TriTri | A-Math 加分題 |
第一個答中有獎
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(v:IydZ2KA
[color=Blue](x - a) [/color] = x - a
C2`W n1`
[color=Blue](x - a) (x - b)[/color] = x^2 – ax – bx + ab
ag4J??Q B4H
[color=Blue](x - a) (x - b) (x – c) [/color] = x^3 – ax^2 – bx^2 – cx^2 + abx + acx + bcx - abc