求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0
求极限lim(xy^2)/(x^2+y^4) (x,y)趋向于0
求个极限 x趋向于1 y趋向于0 lim ln(x+e^y)/√(x^2+y^2)
lim[sin(xy)/xy],x趋向2,y趋向0,求极限
求极限lim「ln(1+xy)」/(x根号y)x趋向于a,y趋向于0+
求极限lim(x^2y^2)/「x^2+y^2+(x-y)^2」 (x,y)趋向于0
lim[2-√(xy+4)]/xy x趋向于0 y趋向于0
求极限lim (e^x)- (e^-x) -2x / (tanx-x) x趋向于0
求极限lim(xy)^2/(x^2+y^2)^2,(x,y)趋于(0,0)
lim(x趋向于0+)x^tanx 求极限?
lim x 趋向于0 时,求 cos(x^2)/x 极限
求极限:lim[√(2X+1)-3]/[√(x-2)-√2] x趋向于4?limx/[1-√(1+x)] x趋向于0 (
证明极限不存在lim (x 和y)趋向于无穷大 (x^2-5y^2) / (x^2+3y^2) 证明该极限不存在