Question

URGENT ! DAU COROANA!
Rezolvati in Z inecuatiile
a) x+1<5
b) x-3>sau egal-5
c) -x d) x:(-6)<2
2) 2x-1>sau egal 7
5x-9<-24
2x-7>sau egal -19
3)a.2(x-1)<-6
b.2(x+8) c.3+2(x+2)<5
4) a. 3x>-80
b . 3x+1>-12

Answer 1

a) x<4  x∈{...0,1,2,3}
b)x≥-5+3   => x≥-2    x∈  {-2,-1,0,..}
c)nu are logica ce ai scis tu acolo
d)x/-6<2   amplifici 2 cu 3 =>   -x/6<6   =  -x<6=> x>6  x∈{6,7,8,...}


2)
a) 2x-1≥7
  2x≥8
x≥4 x∈{4,5,6,7...}
 
b)5x-9<-24
5x<15
x<3  x ∈ {...1,2}

3)  2x-2<-6
  2x<-4
x<-2
x∈ {...-4,-3}
 b) nu e inecuatie, nu e nici un semn
c)3+2(x+2)<5
 3+2x+4<5
2x<-2
x<-1       x∈{...-3,-2}

4)   3x>-80
  x>-80/3
b)  3x+1>-12
  3x>-13
x>-13/2