lim(x->无穷大)(x^3-3x)/3-2x^2)=?
问题描述：
lim(x->无穷大)(x^3-3x)/3-2x^2)=?
答
lim(x->无穷大)(x^3-3x)/(3-2x^2)= lim(x->无穷大) ((x^3-3x)/x^2)/((3-2x^2)/x^2) 分子分母各除 x^2= lim(x->无穷大) (x-3/x) / (3/x^2- 2) x->无穷大 3/x 项和3/x^2都没有了分母剩-2 分子郤还有x 那就是说 lim(x->...