证明lim(x,y)→(0,0),xy/根号(x²+y²)=0
证明lim(x,y)→(0,0),xy/根号(x²+y²)=0
lim(x,y)-(0,0)=根号下(xy+9)-3/xy
lim xy/(x+y)的极限不存在怎么证明啊? (x,y)--(0,0)
证明lim[(xy)/(x平方+y)],x趋于0,y趋于0时的极限不存在.
求极限lim x→0 y→0 2xy/根号下1+xy 然后-1 {不在根号里}
lim (x,y)->(0,0) xy/[根号下(xy+1)]-1的值为
lim (x,y)->(0,0) xy/[根号下(xy+1)]-1的值为
高数:x→0,y→2lim[ln(x+e^xy)/x]=?
用定义法证明二重极限lim(√(xy+1)-1)/xy=1/2 x,y都趋于0
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
求极限:lim xy分之{[(1+xy)开3次根号]-1},(x,y)→(0,0)
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-