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1、 第三章函数单元测试题 姓名_学号_一、选择题1下列函数中为奇函数的是1y = x + 2y = xy = x -y = x - 2xA22x( )( )( )f x = kx + b, f 1 = -2, f -1 = 02设函数若则k =1,b = -1 k = -1,b = -1k = -1,b =1 k =1,b =1f (x) = x 2- 41函数的定义域是(-2,2)-2,2() ( )()- ¥,-2 U 2,+¥- ¥,-2 U2,+¥)x +1f (x) =,则f (-2) =已知函数x -111-A1333f (x) = x - 4
2、x + 3函数2( )( )-¥,o-¥,2在在内是减函数在内是减函数( )内是减函数在 (-¥,+¥)内是减函数-¥,4下列函数即是奇函数又是增函数的是11y = 3xy =y = 2x2 y = - xx3( )( )y = f x xÎ R设点(3,4)为奇函数图像上的点,则下列各点在函数图像上的是 (-3,4)(3,-4)(-3,-4)(-4,-3)1y = x +1 -函数的定义域为x ( )-1,0)U(0,+¥)1,+¥-1,+¥ -1,+¥)5下列各函数中,既是偶函数,又是区间y
3、 = x3 y = x + 2x(0,+¥)内的增函数的是y = xy = -x22二、填空题 ( )f x = 5x - 4,1.设2则 f(2),f(x+1)=( )( )f x = 3x -1, f t +1设点函数则( )p 2,-3关于坐标原点的对称点的坐标为1y =的定义域为x -55函数 y = x2 - 2 的增区间为1( )f x = x + 2xf (2) × f ( )6已知函数2,则=2x - 3ìíîx £ 0f (x) =7已知,则 f(-2)x - 3 x > 02三、简答题1判断下列函数中那些是奇函数?哪些是偶函数?2( )f x = 3x( )f x = - +1()(2)x2求下列函数的定义域2x +1( )f 2 =( )f 2 = 2x2 + 3x()()x -13. 写出函数 y= f(x)的增区间_,y= g(x)的减区间_y21-2-ppx-2-1 O2 x2-1y=g(x)-1y=f(x)