【正文】
值點(diǎn)的必要條件是若函數(shù)在該點(diǎn)可導(dǎo),則導(dǎo)數(shù)值為零.例如:函數(shù),使=0,但不是極值點(diǎn).②例如:函數(shù),在點(diǎn)處不可導(dǎo),但點(diǎn)是函數(shù)的極小值點(diǎn).8. 極值與最值的區(qū)別:極值是在局部對(duì)函數(shù)值進(jìn)行比較,最值是在整體區(qū)間上對(duì)函數(shù)值進(jìn)行比較.注:函數(shù)的極值點(diǎn)一定有意義.9. 幾種常見(jiàn)的函數(shù)導(dǎo)數(shù):I.(為常數(shù)) () II. III. 求導(dǎo)的常見(jiàn)方法:①常用結(jié)論:.②形如或兩邊同取自然對(duì)數(shù),可轉(zhuǎn)化求代數(shù)和形式.③無(wú)理函數(shù)或形如這類函數(shù),如取自然對(duì)數(shù)之后可變形為,對(duì)兩邊求導(dǎo)可得.