lim(n→3) x^2-9/ 5X^2-7X-2
问题描述:
lim(n→3) x^2-9/ 5X^2-7X-2
答
lim(n→3) (x^2-9)/ (5X^2-7X-2) =lim(n→3)(x+3)( x-3)/ (5X^2-7X-2) =lim(n→3)(x+3)( x-3)/ lim(n→3)(5X^2-7X-2) =0/22 =0