求极限. lim (x→0) [√ (xy+4) -2 ]/xy (y→0)
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
求极限lim(x,y)→(0,0) [1-cos(xy)]/xy^2.
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
Lim [2-根号下(xy+4)]/xy,能不能令t=xy后带入求极限?(x,y)→(0,0)
求极限lim x→0 y→0 2xy/根号下1+xy 然后-1 {不在根号里}
求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy.
跪求极限Y=lim (xy+1)/x^4+y^4,当(x,y)→(0,0),
lim[sin(xy)/xy],x趋向2,y趋向0,求极限
求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤
求极限:lim xy分之{[(1+xy)开3次根号]-1},(x,y)→(0,0)
二元函数求极限问题lim[﹙2-e^xy﹚^1/2]-1=lim1/2(1-e^xy)(x,y)→(0,0) (x,y)
求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2