求极限lim (sinxy) / y x->a y->0
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求极限lim(y-x)x/根号下(x^2+y^2) x,y趋近于0
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求极限 lim x→0 y→0[x^2+y^2+5/x+y sin(x+y)] 不懂极限,
跪求极限Y=lim (xy+1)/x^4+y^4,当(x,y)→(0,0),
怎么求多元函数极限lim sin(xy)(x,y)->(0,0) ------- 怎么求这个极限啊?x
求极限lim「ln(1+xy)」/(x根号y)x趋向于a,y趋向于0+