Question

Va rog ajutați-mă :(
C) D) E) F) ​

Answer 1

c)A={1,2,4,8}

x/8=>x apartine D8(multimii divizorilor lui 8)
x={1,2,4,8}

d)|x+3|<5
1.x+3<5 2.x+3<-5
x<5-3. x<-5-3
x<2. x<-8

|x|<=7
1.x<=7
2.x<=-7
(<= mai mic sau egal)

e)4x+11>67
4x>56
x>14

7x-5>=72
7x>=77
x>=11

f)(x2-3) apartine D22
D22={1,2,11,22}
1.x2-3=1=>x2=4 x=2
2.x2-3=2=>x2=5 fals
3.x2-3=11=>x2=14 fals
4.x2-3=22=> x2=25 x=5


|x|<=5
1.x<=5
2.x<=-5