Răspuns :
Răspuns:
8a.
3x-1 ≤ 8
3x ≤ 8+1
x ≤ 9/3=>x ≤ 3
x∈ (-∞ , 3]
b. 2x+9 > 7
2x >7-9
x > -2/2=>x > -1
x∈ (-1 , ∞ )
c. 3-x ≤ 2
-x ≤ 2-3=>x ≥ 1
x ∈ [1 , +∞)
d. 4-2x ≥ 10
-2x ≥ 10-4
x ≤ -6/2=>x ≤ -3
x∈(-∞ , -3]
Răspuns:
8a.
3x-1 ≤ 8
3x ≤ 8+1
x ≤ 9/3=>x ≤ 3
x∈ (-∞ , 3]
b. 2x+9 > 7
2x >7-9
x > -2/2=>x > -1
x∈ (-1 , ∞ )
c. 3-x ≤ 2
-x ≤ 2-3=>x ≥ 1
x ∈ [1 , +∞)
d. 4-2x ≥ 10
-2x ≥ 10-4
x ≤ -6/2=>x ≤ -3
x∈(-∞ , -3]