Modulus; signum; greatest integer and fractional part function

Which of the following is/are not functions ([.] denotes the greatest integer and fractional part functions, respectively) ?

The range of function f(x)=log_(x)([x]), where [.] and {.} denotes greatest integer and fractional part function respectively

If f(x)=[x^(2)]+sqrt({x}^(2)), where [] and {.} denote the greatest integer and fractional part functions respectively,then

Which of the following is/are unity? (where [.] and {.} denote the greatest integer and fractional part functions, respectively)

If f(x) = [x^2] + sqrt({x}^2 , where [] and {.} denote the greatest integer and fractional part functions respectively,then

Find the solution of the equation [x] + {-x} = 2x, (where [*] and {*} represents greatest integer function and fractional part function respectively.

Solve : [x]^(2)=x+2{x}, where [.] and {.} denote the greatest integer and the fractional part functions, respectively.

Solve : [x]^(2)=x+2{x}, where [.] and {.} denote the greatest integer and the fractional part functions, respectively.

Number of solution of equation [x]^2=x+2{x} is/are , where [.] and {.} denote the greatest integer and the fractional part functions, respectively

Solve the equation [x]+{-x}=2x, (where [.l and {} represents greatest integer function fractional part function respectively)