题目3、lim_((x,y)to(0,0))(ln(1+x^2+y^2))/(x^2)+y^(2)=()。A. 0B. 13、$\lim_{(x,y)\to(0,0)}\frac{\ln(1+x^{2}+y^{2})}{x^{2}+y^{2}}=()$。A. 0B. 1题目解答答案B. 1