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HELPP !
rezolvati in Z_ urmatoarele inecuati :
2x+11 ≥x+8
2x -3≤3x+1
4x +10 > 3 ( x+2 )
2(x+5 ) ≤5x + 19




Răspuns :

2x+11≥x+8
2x-x≥8-11
x≥-3 
x∈[-3,+∞)

2x-3≤3x+1
3x-2x≥-3-1
x≥-4
x∈[-4,+∞)

4x +10 > 3 ( x+2 ) 
4x+10>3x+6
4x-3x>6-10
x>-4
x∈(-4,+∞)

2(x+5 ) ≤5x + 19 
2x+10≤5x+19
5x-2x≥10-19
3x≥-9
x≥-3
x∈[-3,+∞)


a)2x+11≥x+8
2x-x≥8-11
x≥-3
x=0
b)2x-3≤3x+1
2x-3x≤1+3
-x≤4
x=0
c)4x+10>3(x+2)
4x+10>3x+6
4x-3x>6-10
x>-4
x=0
d)2(x+5)≤5x+19
2x+10≤5x+19
2x-5x≤19-10
-3x≤9
x=0