求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0

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求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0
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求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0
求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0

求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0
可以设y=x;y=2x分别代入求极限