问题标题:
x^3-4x^2y+xy^2
问题描述:

x^3-4x^2y+xy^2

罗守靖回答:
  x^3-4x^2y+xy^2   =x(x²-4xy+y²)   =x(x²-4xy+4y²-3y²)   =x[(x-2y)²-3y²]   =x(x-2y+√3y)(x-2y-√3y)
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