(x→∞,y→∞)lim(x^2+y^2)÷(arctanx+(x-y)^2)求极限

lim(x→+∞)(2/π*arctanx)^x求极限 lim x→-∞ arctanx/2求极限 求极限lim(x,y)→(+∞,+∞) (xy/(x^2+y^2))^x^2 求极限lim(x,y)→(+∞,+∞) [(xy)/(x^2+y^2)]^xy. 求极限lim(x→∞)(1+1/x)(2-((x+1)/x^2)*arctanx) lim(x→0y→1)(1+xe^y)^(2y+x/x)求极限 求1、lim(x→∞)10^1/x的极限 2、lim(x→1)arctanx的极限, 用洛必达法则求下列函数的极限.lim((兀/2-arctanx)/(1/x)) x→∞ 多元函数极限求解lim(x→∞,y→∞)((x+y)/(x^2+xy+y^2))=? 求极限lim(x→1 y→2) (x²+y²)/xy 求下列各极限 lim(x,y)→(0,1) (2-xy)/(x^2+2y) 二元函数求极限：lim sin（x^2+y）/(x^2+y^2) x→0,y→0