limx→1(x^2-1)⼀2x^2-x-1的值

2024-11-18 17:41:02
推荐回答(2个)
回答1:

lim(x^2-1)/(2x^2-x-1)=lim(x-1)(x+1)/((x-1)(2x+1))=lim(x+1)/(2x+1)=2/3

回答2:

(x+1)(x-1)
= limit -------------
x-->1 (2x+1)(x-1)
x+1
= limit -------------
x-->1 2x+1
=2/3