高数极限题 求详解
1个回答
2016-07-31
展开全部
lim(1-x)/[1-x^(1/3)]
=lim[1-x^(1/3)][1+x^(1/3)+[x^(2/3)]/[1-x^(1/3)]
=lim[1+x^(1/3)+[x^(2/3)]
=3
所以,是同阶无穷小。
注:a³-b³=(a-b)(a²+ab+b²)
所以,1-x=[1-x^(1/3)][1+x^(1/3)+[x^(2/3)]
=lim[1-x^(1/3)][1+x^(1/3)+[x^(2/3)]/[1-x^(1/3)]
=lim[1+x^(1/3)+[x^(2/3)]
=3
所以,是同阶无穷小。
注:a³-b³=(a-b)(a²+ab+b²)
所以,1-x=[1-x^(1/3)][1+x^(1/3)+[x^(2/3)]
追问
能把化简的步骤再详细点吗
谢谢
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