Question

E(x)=6/(x+1) 
Pentru ce numere reale a , expresia E(a) are sens ?
 Cu explicatii !

Answer 1

E(a)=6/(a+1)
PUNEM CONDITIA
a+1≠0 DEOARECE IMPARTIREA LA 0 NU ARE SENS
a≠-1
a∈R-1

Answer 2

x+1∈D6
D6={1,2,3,6}
x+1=1⇒x=1-1⇒x=0
x+1=2⇒x=2-1⇒x=1
x+1=3⇒x=3-1⇒x=2
x+1=6⇒x=6-1⇒x=5
x∈{0,1,2,5}
E(0)=6/0+1=6
E(1)=6/(1+1)=6/2=3
E(2)=6/(2+1)=6/3=2
E(5)=6/(5+1)=6/6=1