lim(2-√ ̄(xy+4))/xy x→0 y→0
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
lim[2-√(xy+4)]/xy x趋向于0 y趋向于0
Lim [2-根号下(xy+4)]/xy,能不能令t=xy后带入求极限?(x,y)→(0,0)
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
跪求极限Y=lim (xy+1)/x^4+y^4,当(x,y)→(0,0),
求极限lim(x,y)→(0,0) [1-cos(xy)]/xy^2.
高数:x→0,y→2lim[ln(x+e^xy)/x]=?
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.
二元函数极限lim(x,y)→(0,0)xy/√(x∧2+y∧2).书上用夹逼定理做的.即0<|xy|/√(x∧2+y∧
证明lim(x,y)→(0,0),xy/根号(x²+y²)=0
求极限lim(xy)^2/(x^2+y^2)^2,(x,y)趋于(0,0)