2.我們不妨定義:如果兩個(gè)圖形(或函數(shù)圖象)關(guān)于y軸對(duì)稱(chēng),我們稱(chēng)互為蝴蝶圖形(或互為蝴蝶圖象);如果兩個(gè)圖形(或函數(shù)圖象)關(guān)于x軸對(duì)稱(chēng),我們稱(chēng)互為倒影圖形(或互為倒影圖象);如果兩個(gè)圖形(或函數(shù)圖象)關(guān)于原點(diǎn)對(duì)稱(chēng),我們稱(chēng)互為夢(mèng)幻圖形(或互為夢(mèng)幻函數(shù)圖象).
(1)在圖1中畫(huà)出△ABC的蝴蝶圖形;
(2)直接寫(xiě)出圖象y=x+1的倒影圖象的解析式:
;
(3)已知函數(shù)圖象m是函數(shù)圖象y=x
2-2x-3的夢(mèng)幻函數(shù)圖象,則函數(shù)圖象m的解析式為
(要求頂點(diǎn)式),并列表描點(diǎn)法在圖2畫(huà)出函數(shù)圖象m,利用函數(shù)圖象m直接寫(xiě)出當(dāng)-3<x<0,y的取值范圍
.
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