若函數(shù)f(x)的圖象過點(diǎn)(0,1),則函數(shù)f(4-x)的圖象必過點(diǎn)( )
A.(4,1)
B.(1,4)
C.(3,0)
D.(0,3)
【答案】分析:由題意,函數(shù)f(x)的圖象過點(diǎn)(0,1),即當(dāng)函數(shù)值為1時(shí),自變量可為0,由此可令4-x=0爭出此時(shí)x的值及對(duì)應(yīng)的y的值,即可求得函數(shù)圖象所過定點(diǎn),選出正確選項(xiàng)
解答:解:由題意函數(shù)f(x)的圖象過點(diǎn)(0,1),即當(dāng)函數(shù)值為1時(shí),自變量可為0
由此知,當(dāng)函數(shù)f(4-x)的函數(shù)值為1時(shí),4-x=0有意義,即x=4
所以函數(shù)f(4-x)的圖象必過點(diǎn)(4,1)
故選A
點(diǎn)評(píng):本題考查函數(shù)圖象及其變化,考查函數(shù)圖象的特征在函數(shù)圖象變化時(shí)變與不變,理解函數(shù)圖象特征及圖象變化時(shí)的變與不變是解本題的關(guān)鍵.