求极限lim(x→+∞,y→+∞) (X+Y)/(X^2-Y^2)
求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2
求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy.
lim(x→0y→1)(1+xe^y)^(2y+x/x)求极限
多元函数极限求解lim(x→∞,y→∞)((x+y)/(x^2+xy+y^2))=?
求极限lim(x→1 y→2) (x²+y²)/xy
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
二元函数求极限:lim sin(x^2+y)/(x^2+y^2) x→0,y→0
二元函数求极限:lim (sin(x^2+y)) / (x^2+y^2) x→0,y→0
求极限 lim x→0 y→0[x^2+y^2+5/x+y sin(x+y)] 不懂极限,
lim((x-y)/(x+y))求极限.(x,y)→(0,0)
求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤
lim(xy/(x^2+y^2))^x^2 x,y趋近无穷 求极限