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\int_{a}^{b} x(f(x)-g(x))dx=\int_{a}^{b} xd[F(x)-G(x)]=x(F(x)-G(x))|_{a}^{b} - \int_{a}^{b}(F(x)-G(x))dx<=0.
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math105:±à¼­ÄÚÈÝ 2011-05-20 17:46
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