设g(x)=f(x)/x^2
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g(x)å¨[a,b]è¿ç»ï¼(a,b)å¯å¯¼ï¼ä¸ï¼x^2ï¼'=2xå¨(a,b)â 0ï¼
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åå¨w2â(a,b),使å¾f'(w2)/2*w2=(f(b)-f(a))/(b^2-a^2)ï¼å¼ä¸ï¼
åf(x)å¨[a,b]è¿ç»ï¼(a,b)å¯å¯¼;
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