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> 怎么看增函數(shù)還是減函數(shù)
怎么看增函數(shù)還是減函數(shù)(怎么看增函數(shù)還是減函數(shù)呢)
1可以通過(guò)復(fù)合函數(shù)的性質(zhì)來(lái)判斷通則增，異則減2通過(guò)經(jīng)驗(yàn)例如，加負(fù)號(hào)改變單調(diào)性等3求導(dǎo)導(dǎo)函數(shù)確實(shí)方便而直接增函數(shù)+增函數(shù)=增函數(shù) 減函數(shù)+減函數(shù)=減函數(shù) 增函數(shù)減函數(shù)=增函數(shù) 減函數(shù)增函數(shù)=減函數(shù)。 如果函數(shù)的導(dǎo)數(shù)大于0，則該函數(shù)為增函數(shù)如果函數(shù)的導(dǎo)數(shù)小于0，則該函數(shù)為減函數(shù)例如，對(duì)于函數(shù)fx = x...