Răspuns:
a) A U B ={1,2,3,4,5,6,7,8,9}
b) A U C ={1,2,3,4,5,6,7,12}
c)B U C={1,2,3,5,6,7,8,9,12}
d)A╭╮B={5,6,7}
Explicație pas cu pas:
e)A╭╮C={1,2,3,7}
f)B╭╮C={7}
g)AᴗBᴗC={1,2,3 4 5,6,7,8,9,12}
h)A╭╮B╭╮C={7}
i)A\B={1,2,3,4}
j)B\C={5,6,8,9}
k)A\C={4,5,6}
l)Aᴗ(B╭╮C)={1,2,3,4,5,6,7}ᴗ{7}={1,2,3,4,5,6,7}