lim((x^2)y)/(x^4+y^2),x和y都趋向于0
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lim((x^2)y)/(x^4+y^2),x和y都趋向于0
lim((x^2)y)/(x^4+y^2),x和y都趋向于0
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lim((x^2)y)/(x^4+y^2),x和y都趋向于0
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