Răspuns :
a)2x+8>sau egal 0
2x >sau egal -8
x>sau egal -4
b)-2x+4 <0
-2x <-4
x>2
c)-8x-40 <sau egal 0
-8x <sau egal 40
x >sau egal -5
d)-2x+3 >3
-2x>0
x<0
e)3x-7 <sau egal -x+1
3x+x <sau egal 1+7
4x <sau egal 8
x <sau egal 2
f)-2x+1>sau egal -3x-x
-2x+1>sau egal -4x
-2x+4x>sau egal -1
2x>sau egal -1
x>sau egal - 1/2
2x >sau egal -8
x>sau egal -4
b)-2x+4 <0
-2x <-4
x>2
c)-8x-40 <sau egal 0
-8x <sau egal 40
x >sau egal -5
d)-2x+3 >3
-2x>0
x<0
e)3x-7 <sau egal -x+1
3x+x <sau egal 1+7
4x <sau egal 8
x <sau egal 2
f)-2x+1>sau egal -3x-x
-2x+1>sau egal -4x
-2x+4x>sau egal -1
2x>sau egal -1
x>sau egal - 1/2
a) 2x ≥ -8 ⇔ x≥-4 x∈ { -4 ; -3; -2; -1 ; 0 ; 1; 2 ;..................}
b) -2x < -4 |:(-2)⇔ x>2 x∈ { 3; 4 ; 5; ........................................}
c) -8x ≤ 40 |:(-8) ⇔ x≥ -5 x∈ {-5;-4 ;-3;-2;-1;0;1;2;3....................}
d) -2x > 0 |:(-2)⇔ x<0 x∈ {........................-2;- 1 }
e)3x+x ≤7+1 ⇔ 4x ≤ 8 |:4 ⇔ x≤ 2 x∈ {................................-2; -1; 0; 1; 2}
f) -2x+3x+x≥ -1 ⇔ 2x≥ -1| :2 ⇔ x≥ -1/2 x∈ { 0 ; 1;2;3;4 ..................................}
b) -2x < -4 |:(-2)⇔ x>2 x∈ { 3; 4 ; 5; ........................................}
c) -8x ≤ 40 |:(-8) ⇔ x≥ -5 x∈ {-5;-4 ;-3;-2;-1;0;1;2;3....................}
d) -2x > 0 |:(-2)⇔ x<0 x∈ {........................-2;- 1 }
e)3x+x ≤7+1 ⇔ 4x ≤ 8 |:4 ⇔ x≤ 2 x∈ {................................-2; -1; 0; 1; 2}
f) -2x+3x+x≥ -1 ⇔ 2x≥ -1| :2 ⇔ x≥ -1/2 x∈ { 0 ; 1;2;3;4 ..................................}