已知函數(shù)f(x)的反函數(shù)f-1(x)的圖象經(jīng)過A(1,O)點(diǎn),則函數(shù)y=f(x-1)的圖象必過點(diǎn)( )
A.(1,1)
B.(-l,1)
C.(-1,2)
D.(0,1)
【答案】分析:欲求函數(shù)y=f(x-1)的圖象必經(jīng)過哪一個(gè)點(diǎn),根據(jù)互為反函數(shù)圖象的對(duì)稱性知,可先求函數(shù)y=f(x)的圖象必經(jīng)過哪一個(gè)點(diǎn),函數(shù)y=f(x-1)的圖象必過點(diǎn)(1,1),從而解決問題.
解答:解析:若函數(shù)f(x)的反函數(shù)f-1(x)的圖象經(jīng)過A(1,O)點(diǎn),
則函數(shù)f(x)的圖象過(0,1)點(diǎn),
則有f(0)=1,
則函數(shù)y=f(x-1)的圖象必過點(diǎn)(1,1).
故選A.
點(diǎn)評(píng):本題考查反函數(shù)的圖象的對(duì)稱性,屬于基礎(chǔ)題目,要會(huì)求一些簡(jiǎn)單函數(shù)的反函數(shù),掌握互為反函數(shù)的函數(shù)圖象間的關(guān)系.
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