因式分解：(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)

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因式分解：(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)
因式分解：(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)

因式分解：(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)
：(2x-y)(x^2+xy-2y^2)
=（2x-y）（x+2y)(x-y)
xy(x^2-xy)(-3xy^2)
=xy*x(x-y)*(-3xy^2)
=-3x^3y^3(x-y)

(2x-y)(x^2+xy-2y^2)
=(2x-y)(x+2y)(x-y)
xy(x^2-xy)(-3xy^2)
=-3x^3y^3(x-y)

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