lim1⼀1+x—3⼀1+x^3 x趋向于-1

2024-11-23 02:11:39
推荐回答(2个)
回答1:

简单分析一下,答案如图所示

回答2:

解:
lim [1/(1+x) -3/(1+x³)]
x→-1
=lim [(1-x+x²)/(1+x)(1-x+x²) -3/(1+x)(1-x+x²)]
x→-1
=lim (1-x+x²-3)/[(1+x)(1-x+x²)]
x→-1
=lim (x²-x-2)/[(1+x)(1-x+x²)]
x→-1
=lim (x+1)(x-2)/[(1+x)(1-x+x²)]
x→-1
=lim (x-2)/(1-x+x²)
x→-1
=(-1-2)/[1-(-1)+(-1)²]
=(-3)/3
=-1