[" se "Q],[" If "Q" ,then "f" is continuous at "],[[" (2) only at "0,1," (3) all real numbers "]]

If f(x)={x,x in Q;-x,x!in Q then f is continuous at

Let f and g be two real functions; continuous at x=a Then alpha f and (1)/(f) is continuous at x=a provided f(a)!=0 and alpha is a real number

" If the function "f(x)=[[x^(2)+px+1,,x in Q],[px^(2)+2x+q,,x in Q]" is continuous at "x=1" and "x=2," then "(p+q)" is equal to "

Let f(x+y)=f(x)+f(y) for all real x and y . If f (x) is continuous at x = 0 , show it is continuous for all real values of x .

Function f(x)={-1,x in Q and 1,x!in Q is continuous at x=0

Proved that: f(x)=[x\ if\ x in Q0\ if\ x !in Q\ is continuous only at x=0.

Proved that: f(x)=[x\ if\ x in Q-x\ if\ x !in Q\ is continuous only at x=0.