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[学习/校园/考试] 求chegg这题答案！

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发表于 2014-11-7 19:12:30 | 只看该作者回帖奖励

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http://www.chegg.com/homework-help/questions-and-answers/following-integrals-give-power-simple-exponential-function-integrated-similar-infinite-dom-q5009076

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小小小庆子

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1. Approximately f(x) = 1 when x is large. So, it will diverge.2. Assume z is very large, then function is approximately f(x) = e^(-x) is converging.3. Assuming x is large, f(x) = 1/(x^3 + 2x^2) which is converging.4. Assuming x is large, f(x) = 1/(x+3), which is diverging 不用谢！

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发表于 2014-11-7 19:12:31 | 只看该作者

1. Approximately f(x) = 1 when x is large. So, it will diverge.

2. Assume z is very large, then function is approximately f(x) = e^(-x) is converging.

3. Assuming x is large, f(x) = 1/(x^3 + 2x^2) which is converging.

4. Assuming x is large, f(x) = 1/(x+3), which is diverging

不用谢！

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