Hei! Cine ma poate ajuta?
Răspunsuri la întrebare
1 . a ) 3x -5 < 0
3x < 5
x = 5 supra 3
b ) -2x + 4 > 0
-2x > -4
x < 2
c ) 12 -x < 0
-x < -12
x > 12
d ) 4x -12 > 0
4x >12
x >3
e ) 7x > 1
x > 1 supra 7
f ) 5x > -3
x > - 3 supra 5
g ) x > -1
x < -1
h ) x + 1 supra 2 > 0
x + 1 >0
x > -1
2 . a ) x -7 > 0
x >7
b ) 2x +8 <0
2x < -8
x < -4
c ) 4x- 4 < 0
4x < 4
x < 1
d ) 3x +12 > 0
3x > -12
x > -4
e ) -6x +12 < 0
-6x < -12
x > 2
f ) 9x -18 > 0
9x > 18
x >2
g ) -5x +20 > 0
-5x > -20
x < 4
h ) 3x > 0
x > 0
3. a ) 4x + 40 < 2x
4x -2x < -40
2x < -40
x < -20
b ) -5x -7 <13
-5x < 13 +7
-5x < 20
x >-4
c ) 9 -x > 8x
-x -8x > -9
-9x > -9
x < 1
d ) -7 +4x < 11
4x < 11 +7
4x <18
x < 9 supra 2
e ) -3 x + 1 > x -3
-3x -x > -3 -1
-4x >-4
x < 1
f ) \sqrt{3} x - 8\sqrt{3} > 0
\sqrt{3} x > 8\sqrt{3}
x >8
g ) 3 supra 4 x - 6 supra 4 < 0
3x -6 < 0
3x < 6
x < 2
h ) 3x -5 supra 2 > 0
3x -5 >0
3x >5
x > 5 supra 3
4 . a ) 1 supra 2x -1 >0
2x -1 > 0
2x > 1
x > 1 supra 2
b ) 3 supra 3x +2 < 0
3x +2 <0
3x < -2
x < - 2 supra 3
c ) 2 supra 5x -2 < 0
5x -2 < 0
5x < 2
x < 2 supra 5
d ) 4 supra 2x + 1 > 0
2x + 1 > 0
2x > -1
x > -1 supra 2
e ) -3 supra 2x -2 < 0
- 3 supra 2x -2 < 0
1 supra 2x -2 < 0
2x -2 > 0
2x > 2
x >1
f ) -3 supra -5x +1 > 0
- 3 supra -5x + 1 >0
1 supra -5x +1 < 0
-5x + 1 < 0
-5x < -1
x > 1 supra 5
g ) -2 supra 4x + 2 > 0
-2 supra 4x + 2 > 0 ; x = - 1 supra2
-2 supra 2(2x+1 ) > 0
-1 supra 2x +1 >0
1 supra 2x +1 <0
2x + 1< 0
2x < -1
x < - 1 supra 2 ; x = - 1 supra 2
x apartine ( - infinit , - 1 supra 2 )
