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求有界性和求值域是不同的問題,前者要求很松,後者要求更精確,看問題的要求了.有界性的判斷有很多方法,最直觀的一個就是根據函數的單調性判斷有界性,還有,諸如在閉區間上連續函數有界等等法則:針對本題:y=√(x+1)-…
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