求极限Limx→³√1＋x－1/x
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解决时间 2021-01-31 10:30
- 提问者网友：疯孩纸
- 2021-01-31 02:06
求极限Limx→³√1＋x－1/x
最佳答案
- 五星知识达人网友：鸽屿
- 2021-01-31 03:14
分子分母同乘[ x^2 - (1-x^3)^(1/3) + (1-x^3)^(2/3) ]有理化：
lim(x->∞) [x + (1-x^3)^(1/3)]
=lim(x->∞) [ x^3 + (1-x^3) ]/[ x^2 - (1-x^3)^(1/3) + (1-x^3)^(2/3) ]
=lim(x->∞) 1 /[ x^2 - (1-x^3)^(1/3) + (1-x^3)^(2/3) ]
=lim(x->∞) (1/x^2)*1/[ 1-(1/x^6-1/x^3)^(1/3) + (1/x^3-1)^(2/3) ]
=0
lim(x->∞) [x + (1-x^3)^(1/3)]
=lim(x->∞) [ x^3 + (1-x^3) ]/[ x^2 - (1-x^3)^(1/3) + (1-x^3)^(2/3) ]
=lim(x->∞) 1 /[ x^2 - (1-x^3)^(1/3) + (1-x^3)^(2/3) ]
=lim(x->∞) (1/x^2)*1/[ 1-(1/x^6-1/x^3)^(1/3) + (1/x^3-1)^(2/3) ]
=0
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