Re: [极限] 极限问题

楼主: Honor1984 (希望愿望成真)   2017-10-24 17:21:46
※ 引述《chemist (analysis)》之铭言:
: https://i.imgur.com/NNvM40U.jpg
: 第36题 麻烦各位
L = 1
给定ε
0 < |x - 2| < δ
先选δ = 1
|x + 2| < 5
L = 1
|(x^2 - 3) - 1| = |x^2 - 4| = |x - 2||x + 2| < 5δ <= ε
可选择δ = min{ε/5, 1}
题目给定ε = 0.01
=> 选δ = 0.002

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