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Éè f(x) ºÍ g(x) µÄÔ­º¯ÊýÊÇ F(x) ºÍ G(x), ¸ù¾ÝÌõ¼þ F(a)=F(b)=0, F(b)=G(b) and F(x)>=G(x), x\in [a,b]

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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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