求极限 lim((x,y)→(0,0)) (x^2+y^2)sin1/xy
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
求极限lim(xy)^2/(x^2+y^2)^2,(x,y)趋于(0,0)
证明当x,y都趋于0时,极限lim(x^2+y^2)sin1/xy=0 要详细的解答过程
lim( x^2 sin1/x)/x,也是求极限,x趋于0
求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy.
求一道二元函数极限,Lim (x+y)[sin1/x]*[cos1/y](x,y)→(0,0)x,y分别趋向于0
lim(1/x^2sin1/x)求极限(lim下是x~0) ,考研题
求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤
多元函数的极限问题lim(x^2+y^2)*sin1/(x^2+y^2)求当x and y趋近于0的极限是多少?虽然我可
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
lim[sin(xy)/xy],x趋向2,y趋向0,求极限
求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2