Series
2011-11-22 5:55 am
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回答 (1)
2011-11-22 7:47 am
✔ 最佳答案
∵f(x) be continuous on [a,b] and f(x)>=oAssume f(x)≠0
so f(x)>0
∫(a,b)f(x)dx>0 (contradiction)(∵∫(a,b)f(x)dx=0)
so f(x)=0 for x in [a,b]
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20111121000051KK00974