æå¼ç¹æ¯f`(x)=0çæ ¹
é©»ç¹æ¯f``(x)=0对åºçæ ¹x0,æ ¹å¯¹åºçå½æ°å¼æç¡®å®çåæ
ï¼x0,f(x0)
举个ä¾åï¼fï¼x)=1/3x^3-2x^2
æ±å½æ°çæå¼ç¹åé©»ç¹
f`=0
x^2-4x=0
x(x-4)=0
x=0orx=4
é©»ç¹æ¯x=0orx=4
f``=0
2x-4=0
2x=4
x=2
f(2)=-16/3
é©»ç¹æ¯ï¼2ï¼-16/3)
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