Problemlimx→3(x2+1)\lim_{x \to 3}(x^2 + 1)limx→3(x2+1)分步解答f(x)=x2+1f(x) = x^2 + 1f(x)=x2+1 是多项式 — 处处连续。直接代入：limx→3(x2+1)=32+1=10\lim_{x \to 3}(x^2 + 1) = 3^2 + 1 = 10limx→3(x2+1)=32+1=10。答案101010想解其他题？打开 limit 求解器 →相关例题/solve/calculus/limit-of-x2-as-x-approaches-2