é¢ç®è®¾å®çæ¡ä»¶f(x)æ¯è¿ç»å½æ°ï¼èä¸æ»¡è¶³æ³°åå
¬å¼çæ¡ä»¶ã
æ ¹æ®æ³°åå
¬å¼ï¼å¯¹ä»»æ -1<=x<=1,
æ f(x)=f(0)+f'(0)x+ï¼1/2ï¼Ãf''(tx)x^2=ï¼1/2ï¼f''(tx)x^2, å
¶ä¸ 0<t<1.
å 为æçéåºé´ä¸çå½æ°ä¸å®æçï¼é¢ç®åå设f''(x)å¨x=0çé»åå
è¿ç»ï¼æ以
f''(x)=2*f(x/t)/(x/t)^2 æçã
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