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[ Last edited by javeey on 2010-5-17 at 21:10 ]
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proof:

abs(x)<=A   (A>0)ʱ£¬f(x)=x^3*e^(-x^2)ÔÚ[-x,x]ÉÏÁ¬Ðø£¬¹ÊÓн磻
abs(x)>A             ʱ£¬ f(x) ×ÛÉϿɵÃ
f(x)ÔÚRÉÏÓн硣

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Originally posted by shenswatch at 2010-05-17 23:24:51:
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e^(x^2)>=1+x^2+x^4/2>=1+(x^2+x^4)/2>=1+abs(x^3)
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abs(x^3/e^(x^2))<=abs(x^3)/(1+abs(x^3))<1
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8Â¥2010-05-18 07:26:25
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Originally posted by scuxchen at 2010-05-17 22:25:23:
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