x→2,y→0,求lim sin[(8 -x)y]/xy=多少呀?
lim[sin(xy)/xy],x趋向2,y趋向0,求极限
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求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
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求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2
跪求极限Y=lim (xy+1)/x^4+y^4,当(x,y)→(0,0),
高数:x→0,y→2lim[ln(x+e^xy)/x]=?
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数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤