lim(x,y)->(0,2)(1-3xy)^2/x
求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y)
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求(x,y)趋近于(0,0)时,lim((x^3)+(x^2)y+x(y^2)+(y^3))/((x^2)-xy+(y^
高数:x→0,y→2lim[ln(x+e^xy)/x]=?
求极限lim(xy)^2/(x^2+y^2)^2,(x,y)趋于(0,0)
求极限lim(x→1 y→2) (x²+y²)/xy
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求二重极限lim[xy/(1+x^2+y^2)],x→0,y→0.求详细步骤
lim[2-√(xy+4)]/xy x趋向于0 y趋向于0
lim[sin(xy)/xy],x趋向2,y趋向0,求极限
求极限lim x→0 y→0 2xy/根号下1+xy 然后-1 {不在根号里}
用定义法证明二重极限lim(√(xy+1)-1)/xy=1/2 x,y都趋于0