第四题求数学极限,谢谢 5
2个回答
展开全部
lim [3/(x³-1) -1/(x-1)]
x→1
=lim [3/(x-1)(x²+x+1) -1/(x-1)]
x→1
=lim [3-(x²+x+1)]/[(x-1)(x²+x+1)]
x→1
=lim -(x²+x-2)/[(x-1)(x²+x+1)]
x→1
=lim -(x-1)(x+2)/[(x-1)(x²+x+1)]
x→1
=lim -(x+2)/(x²+x+1)
x→1
=-(1+2)/(1²+1+1)
=-3/3
=-1
x→1
=lim [3/(x-1)(x²+x+1) -1/(x-1)]
x→1
=lim [3-(x²+x+1)]/[(x-1)(x²+x+1)]
x→1
=lim -(x²+x-2)/[(x-1)(x²+x+1)]
x→1
=lim -(x-1)(x+2)/[(x-1)(x²+x+1)]
x→1
=lim -(x+2)/(x²+x+1)
x→1
=-(1+2)/(1²+1+1)
=-3/3
=-1
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询