作者lukechen90 (...?)
站内trans_math
标题[积分应用]
时间Fri May 11 08:39:11 2007
1.show that f'''(x)>0 on an interval, then f is concave upward on that
interval.
2.show that -1/2<x/(1+x^2)<1/2 for every value of x
= =
这两题不知道从哪里切入算会比较好Q_Q
麻烦高手帮解答~~
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※ 编辑: lukechen90 来自: 218.171.163.55 (05/11 13:59)
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1F：→ goshfju:第一题题目错了吧 59.117.70.99 05/11 18:40