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aflati multimea valorilor functiei :
a) f: {-2,-1,5,7}->R ,f(x)=1/x
b) f: {-3,-2,-1,0,1,2}->R ,f(x)=/x/ -1
c) f:R->R ,f(x)=0
d) f:R->R ,f(x)=/x/