Question

Se dau multimile A={x/x= ab ,a=3b } B={y/y=x:31 ,x =A} C={z/ z=y la puterea a 3 a -1, y =A} Calculati: (A intersectat cu C) reunit cu (A diferența C)

Answer 1

b=1 ⇒ a=3⇒ab=31
b=2 ⇒ a=6⇒ ab=62
b=3 ⇒  a=9⇒ ab=93 ⇒ A={31,62,93}

31:31=1 ;  62:31=2  ; 93:31=3
B={1,2,3}

C={0,7,26}
(A n C) U (A\C) = Ф U {31,62,93}= {31 ,62 ,93}