题目8. (5.0分) 极限lim_(x to infty) (3x^3+2x+1)/(x^3)+x=____.A. 1B. 0C. 3D. ∞8. (5.0分) 极限$\lim_{x \to \infty} \frac{3x^{3}+2x+1}{x^{3}+x}=$____.A. 1B. 0C. 3D. ∞题目解答答案C. 3