以下两个极限怎么算一、f(x,y)={xy/(x^2+y^2) (x,y)≠(0,0)0 (x,y)=(0,0)}lim
以下两个极限怎么算一、f(x,y)={xy/(x^2+y^2) (x,y)≠(0,0)0 (x,y)=(0,0)}lim
求极限(工本高数)lim [2-(xy+4)^(1/2)]/xyx->0y->0证明函数f(x,y)=(x+y)/(x-
求极限lim(xy)^2/(x^2+y^2)^2,(x,y)趋于(0,0)
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
lim xy/(x+y)的极限不存在怎么证明啊? (x,y)--(0,0)
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
lim(x→0y→1)(1+xe^y)^(2y+x/x)求极限
证明当(x,y)趋向于(0,0)时,f(x,y)=(1-cos(x^2+y))/(x+y)xy 的极限不存在, 谢谢~
跪求极限Y=lim (xy+1)/x^4+y^4,当(x,y)→(0,0),
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
二元函数求极限一题!lim ln(x+e^y)/sqrt(x^2 + y^2)(x,y)->(1,0)
求证明极限:f(x,y)=xy^2/(x^2+y^2),(x,y)→(0,0)时极限不存在.