作业帮(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
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(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
=14x^3*y/(-7xy)-7x^2*y^2/(-7xy)+21xy^3/(-7xy)
=-2x^2+xy-3y^2
(14x^3*y-7x^2*y^2+21xy^3)/(-7xy)
把各项与-7xy相除得：
原式=-2x²+xy-3y²
化简3(x-y)-7(x--y)+2(y-x)
分解因式:14x^2(x+y)-21(x+y)^2-7xy(x+y)
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