1、冪函數(shù)、指數(shù)函數(shù)、對(duì)數(shù)函數(shù)的圖象與性質(zhì):①指數(shù)函數(shù)y=ax(a>0且a≠1),當(dāng)a>1時(shí),圖象過點(diǎn)(0,1),函數(shù)為增函數(shù),a的值越大,指數(shù)函數(shù)的圖象向上越靠近y軸;當(dāng)0<a<1時(shí),圖象也過點(diǎn)(0,1),函數(shù)為減函數(shù),a的值越小,指數(shù)函數(shù)的圖象向上越靠近y軸。