Question

S III
3)Calculati :2015•29+2015•21-2015•50







4)Fie A={0,1,4,5} si B={4,2,1}. Aflati : AUB,A(intersectat)B,A-B,B-A






5)Daca AUB={0,1,2,3,4,5,6,10};A( intersectat)B={10,5,6};A-B={1,3}, aflati A si B








6) Sumaba doua nr.este 90. Prin impararea primului la al doilea se obtine catul 7 si restul 2.
Aflati cele doua nr.

Answer 1

3) 58435+42315-100750 = 
100750-100750 = 0

6)  a+b = 90
a/b = 7 rest 2
   ⇒a  = 7*b +2
inlocuim in prima ecuatie si avem;
7b+2+b=90
8b=90-2
8b=88
b=88/8
b=11
a = 7*b+2
a= 7*11 +2
a = 77+2
a = 79
Verificare
79+11 = 90

4). A U B ∈{0,1,2,4,5}
     A intersectat B ∈{1,4}
     A - B ∈{0,5}
     B - A∈{2}

5)  A ∈{1,3,5,6,10}
     B∈{0,2,4,5,6,10}