无疑是n→∞,n→0的话直接代入就会了
lim(n→∞) (4n² - 5n - 1)/(7 + 2n - 8n²)
= lim(n→∞) (4 - 5/n - 1/n²)/(7/n² + 2/n - 8)
= (4 - 0 - 0)/(0 + 0 - 8)
= - 1/2
无疑是n→∞,n→0的话直接代入就会了
lim(n→∞) (4n² - 5n - 1)/(7 + 2n - 8n²)
= lim(n→∞) (4 - 5/n - 1/n²)/(7/n² + 2/n - 8)
= (4 - 0 - 0)/(0 + 0 - 8)
= - 1/2