(1)由函數(shù)的解析式可得 2x-1≠0,解得x≠0,故函數(shù)的定義域?yàn)?{x|x∈R,且 x≠0}.
(2)顯然函數(shù)的定義域關(guān)于原點(diǎn)對(duì)稱,f(-x)=(12-x-1+12)(-x)3=(2x1-2x+12)(-x)3
=(2x-1+11-2x+12)(-x)3
=(-1+11-2x+12)(-x)3=-(12x-1+12)(-x)3=(12x-1+12)x3 =f(x),
故函數(shù)f(x)為偶函數(shù).
(3)當(dāng)x>0時(shí),12x-1+12>12,x3>0,∴函數(shù)f(x)=(12x-1+12)x3 >0.
當(dāng)x<0時(shí),12x-1<-1,12x-1+12<0,x3<0,∴函數(shù)f(x)=(12x-1+12)x3 >0.
綜上可得,f(x)>0.