若x=2,求(3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2)的值
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若x=2,求(3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2)的值
(3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2)
=3xy(x^2-2xy+xy)/x^2y^2(y-x)
=3xy(x-y)^2/x^2y^2(y-x)
=3(y-x)/xy
y是多少
再问: 你第二部中+xy怎么来的
再答: (3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2) =3xy(x^2-2xy+y^2)/x^2y^2(y-x) =3xy(x-y)^2/x^2y^2(y-x) =3(y-x)/xy 写错了
再问: 最后一部还是有些不明白
再答: 分子分母的公因式约去
=3xy(x^2-2xy+xy)/x^2y^2(y-x)
=3xy(x-y)^2/x^2y^2(y-x)
=3(y-x)/xy
y是多少
再问: 你第二部中+xy怎么来的
再答: (3x^3y+3xy^3-6x^2y^2)/(x^2y^3-x^3y^2) =3xy(x^2-2xy+y^2)/x^2y^2(y-x) =3xy(x-y)^2/x^2y^2(y-x) =3(y-x)/xy 写错了
再问: 最后一部还是有些不明白
再答: 分子分母的公因式约去
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