课后训练1.已知函数f(x)是奇函数,x>0时,f(x)=1,则f(-2)=( )A.0B.1[来源:www.shulihua.netwww.shulihua.net]C.-1D.±12.若函数f(x)是定义在R上的偶函数,在(-∞,0]上是减函数,且f(2)=0,则使得f(x)<0的x的取值范围是( )A.(-∞,2)B.(2,+∞)C.(-∞,-2)∪(2,+∞)D.(-2,2)3.已知函数f(x)在区间[-5,5]上是偶函数,在区间[0,5]上是单调函数,且f(3)<f(1),则( )A.f(-1)<f(-3)[来源:www.shulihua.net]B.f(0)>f(-1)C.f(-1)<f(1)D.f(-3)<f(-5)4.已知函数(x≠±1)是偶函数,且f(x)不恒等于0,则函数f(x)是( )A.奇函数B.偶函数C.既是奇函数又是偶函数D.非奇非偶函数5.设函数f(x)(x∈R)为奇函数,,f(x+2)=f(x)+f(2),则f(5)等于( )A.0B.1C.D.56.若f(x)=(m-1)x2+6mx+2是偶函数,则f(0),f(1),f(-2)从小到大的顺序是________.7.若f(x)在(-∞,0)∪(0,+∞)上为奇函数,且在(0,+∞)上是增函数,f(-2)=0,则不等式x·f(x)<0的解集为________.8.设f(x)在R上是偶函数,在(-∞,0)上递减,若f(a2-2a+3)>f(a2+a+1),求实数a的取值范围.9.已知函数f(x)是定义域为R的奇函数,当x>0时,f(x)=x2-2x,(1)求出函数f(x)在R上的解析式;(2)画出函数f(x)的图象.
10.设函数f(x)是定义在R上的奇函数,若f(x)满足f(x+3)=f(x),且f(1)>1,f(2)=2m-3,求m的取值范围.
参考答案1.答案:C2.答案:D3.答案:B4.答案:A5.答案:C[来源:www.shulihua.netwww.shulihua.net]6.答案:f(-2)<f(1)<f(0)7.答案:{x|-2<x<0或0<x<2}8.答案:解:由题意知f(x)在(0,+∞)上是增函数.又a2-2a+3=(a-1)2+2>0,,且f(a2-2a+3)>f(a2+a+1),∴a2-2a+3>a2+a+1,即3a<2,.9.答案:解:(1)由于函数f(x)是定义域为R的奇函数,则f(0)=0.设x<0,则-x>0.∵f(x)是奇函数,∴f(-x)=-f(x),∴f(x)=-f(-x)=-[(-x)2-2(-x)]=-x2-2x,综上,(2)图象如图.10.答案:解:∵f(x+3)=f(x),∴f(2)=f(-1+3)=f(-1).∵f(x)为奇函数,且f(1)>1,∴f(-1)=-f(1)<-1.[来源:www.shulihua.netwww.shulihua.net]∴f(2)<-1,即2m-3<-1,m<1.[来源:www.shulihua.net]∴m的取值范围为(-∞,1).