(1)作函數(shù)y=|x-x2|的圖象;
(2)作函數(shù)y=x2-|x|的圖象.
分析:本題考查的是二次函數(shù)與絕對(duì)值綜合作圖的問(wèn)題.在解答時(shí):
(1)首先應(yīng)該將絕對(duì)值函數(shù)化成分段函數(shù),然后利用二次函數(shù)的性質(zhì),分段畫(huà)出函數(shù)的圖象;
(2)同(1)現(xiàn)將絕對(duì)值函數(shù)轉(zhuǎn)化為分段函數(shù),然后利用二次函數(shù)的性質(zhì),分情況討論函數(shù)的圖象.
解答:解:(1)y=
| x-x2 0≤x≤1 | -(x-x2) x>1或x<0 |
| |
即y=
| -(x-)2+ 0≤x≤1 | (x-)2- x>1或x<0 |
| |
其圖象如圖①所示.
(2)y=
即y=
其圖象如圖②所示.
點(diǎn)評(píng):本題考查的是二次函數(shù)與絕對(duì)值綜合作圖的問(wèn)題.在解答的過(guò)程當(dāng)中充分體現(xiàn)了絕對(duì)值的知識(shí)、分段函數(shù)的思想、二次函數(shù)的性質(zhì).注意作圖時(shí)的規(guī)范.值得同學(xué)們體會(huì)和反思.