Question

Fie multimile A={1,2,3,4,5,6,7}, B={5,6,7,8,9} si C={1,2,3,7,12}. Aflati:
a) A∨B;   b) A∨C;   c) B∨C;   d) A∧B;   e) A∧C;   f) B∧C;   g) A∨B∨C;   h) A∧B∧C;   i) A/B;
j) B/C;   k) A/C;   l) A∨(B∧C).

Va rog ajutati-ma maine avem primele 2 ore de mate.

Answer 1

a) A∨B={1, 2, 3, 4, 5, 6,7, 8, 9}

b)A∨C={1, 2, 3, 4, 5, 6, 7, 12}

c)B∨C={1, 2, 3, 5, 6, 7, 8, 9, 12}

d)A∧B={5, 6, 7}

e)A∧C={1, 2, 3, 7}

f)B∧C={7}

g)A∨B∨C=∨{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)A∨(B∧C)=A∨{7}= {1, 2, 3, 4, 5, 6, 7}