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 令 a=A1, b=A2, c=A3, ..., z=A26
 且令 B = { 1, 2, 3, ..., 26 } 
 
 (y-a)(y-b)(y-c)*.....*(y-z)
 = y^26 
    - (a+b+...+z)*y^25 
    + (ab+ac+...+az+bc+bd+...+bz+...+yz)*y^24
    - .............
    + abc*...*z
 = y^26
    - ΣAi*y^25 , i from 1 to 26
    + ΣAi*Aj*y^24 , ∀ i, j ∈ B 且 i≠j
    - ΣAi*Aj*Ak*y^23 , ∀ i, j, k ∈ B 且 i, j, k皆不同
    + ............
    + A1*A2*A3*.....*A26

 Ans:
 y^26
 - ΣAi*y^25 , i from 1 to 26
 + ΣAi*Aj*y^24 , ∀ i, j ∈ B 且 i≠j
 - ΣAi*Aj*Ak*y^23 , ∀ i, j, k ∈ B 且 i, j, k皆不同
 + ............
 + A1*A2*A3*.....*A26
 
 其中:
 A1=a, A2=b, A3=c, ..., A26=z
 B = { 1, 2, 3, ..., 26 }

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