Question

Buna brainly ajutati-ma la ex 5 si 6.

Answer 1

nu sunt sigur ca e bine ex 6 b dar sper ca te-am ajutat.Coroana?

Answer 2

5. [|-14|:(-2)+(-8)+1]:|-2|
[14:(-2)-8+1]:2
[-7-8+1]:2=[-15+1]:2= -14:2= -7

6. a) daca -4<\ x<\ 6 => x={-4,-3,-2,-1,0,1,2,3,4,5}
daca x= -4=> -4×4+6= -16+6= -10 nu este divizibil cu 3
daca x= -3=> -3×4+6= -12+6= -6 € 3
daca x= -2=> 4×(-2)+6= -8+6= -2 nu apartine D3
daca x= -1=> 4×(-1)+6= 2 nu apartine D3
daca x=0=> 4×0+6=6 € D3
daca x=1=> 4×1+6=10 nu aparţine D3
daca x=2=> 4×2+6=14 nu apartine D3
daca x=3=> 4×3+6=18 € D3
daca x=4=> 4×4+6=22 nu apartine D3
daca x=5 => 4×5+6=26 nu aparţine D3
=> x poate fi doar {-6,6,18}

b) M15={15,30,45,60,75...}
2x+1=15=> 2x=14=> x=7
2x+1=30=> 2x=29=> x=14,5 nu apartine Z
2x+1=45=> 2x=44=> x=11
2x+1=60=> 2x=59=>x=29,5 nu apartine Z
2x+1=75=> 2x=74=> x=37
din asta reiese ca x={7,11,37....} doar daca M15 sunt numere in care ultima cifra este 5

c) dacă x=3=> 8/3-3=8/0=0 €N
daca x=4=> 8/4-3=8/1=8 €N
daca x=5=> 8/5-3=8/2=4 € N
daca x=6=> 8/6-3=8/3 nu aparţine N
daca x=7=> 8/7-3=8/4=2 € N
daca x=8=> 8/8-3=8/5 nu apartine N
daca x=11=> 8/11-3=8/8=1 € N
=> x={3,4,5,7,11}