函數(shù)圖像及函數(shù)方程(學生版)

1、WD格式整理專業(yè)資料值得擁有函數(shù)圖像與函數(shù)方程【知識要點】1.函數(shù)圖象變換(1)平移變換(2)對稱變換①；)(xfy?――→關于x軸對稱)(xfy??②；)(xfy?――→關于y軸對稱)(xfy??③；)(xfy?――→關于原點對稱)(xfy???④.)10(???aaayx且――→關于y＝x對稱)10(log???aaxya且(3)翻折變換①.)(xfy?――――――――――→保留x軸上方圖像將x軸下方圖像翻折上去|)(|xfy?②.

2、)(xfy?――――――――――――→保留y軸右邊圖像，并作其關于y軸對稱的圖像|)(|xfy?(4)伸縮變換①.)(xfy?)(axfy?②.)(xfy?)(xafy?2.函數(shù)的零點(1)函數(shù)零點的定義對于函數(shù)，把使的實數(shù)叫做函數(shù)的零點))((Dxxfy??0)(?xfx))((Dxxfy??(2)幾個等價關系方程有實數(shù)根函數(shù)的圖象與軸有交點函數(shù)有零點0)(?xf?)(xfy?x?)(xfy?(3)函數(shù)零點的判定(零點存在性定理)如果