Question

Rezolvați în z inecuațiile: a) 2x-3 <-5 b) 3x+5>_-7 c)7x-3 <5x-11

Answer 1

a) 2x < -8 => x < -8:2 => x < -4 => x = Z - {-4 ; -3; -2 ; -1 ; 0; 1...}

b) 3x > -12 => x >-12:3 => x > -4 => x = Z - {...-6;-5;-4}

c) 7x - 3 < 5x - 11 => 7x < 5x -11 + 3 => 7x - 5x < -8 => 2x < -8 => x < -4 => x este acelasi raspuns ca la "a)"

:D

Answer 2

a)2x-3<-5
2x<-5+3
2x<-2
x<-1
x = { .......,-3,-2 }
b) 3x+5>-7
3x>-7-5
3x>-12
x>-12/3
x>-4 
x={ -3,-2,-1,0,1,2,3,4...................}
c) 7x-3<5x-11
7x-5x-3<-11
2x-3<-11
2x<-8
x<-4
x={-5,-6,-7..............}