Réponse:
A- 9x-5<7
9x-5+5<7+5
9x<12
X<4
B
2x+5>-3
2x+5-5>-3-5
2x>-8
X>-4
C
1/2x-2<6
1/2x<6+2
1/2x<8
X<16
D
-1/3x+5>-4
-1/3x+5-5>-4-5
-1/3x>-9
-1/3x*3>-9*3
-x>-27
X>27
E
4/3x-1<1/3
4/3x-1+1<1/3+1
4/3x<1/3+3/3
4/3x<4/3
X<1
1/2x+4>5
1/2x+4-4>5-4
1/2x>1
1/2x*2>1*2
X>2
G
-7/5x+2>3
-7/5x+2-2>3-2
-7/5x>1
-7/5x *-5/7>1*-5/7
X>-5/7
H
-1/5x+1/5<0
5(-1/5x+1)<0
-x+1<0
-x+1-1<-1
-x<-1
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Réponse:
A- 9x-5<7
9x-5+5<7+5
9x<12
X<4
B
2x+5>-3
2x+5-5>-3-5
2x>-8
X>-4
C
1/2x-2<6
1/2x<6+2
1/2x<8
X<16
D
-1/3x+5>-4
-1/3x+5-5>-4-5
-1/3x>-9
-1/3x*3>-9*3
-x>-27
X>27
E
4/3x-1<1/3
4/3x-1+1<1/3+1
4/3x<1/3+3/3
4/3x<4/3
X<1
1/2x+4>5
1/2x+4-4>5-4
1/2x>1
1/2x*2>1*2
X>2
G
-7/5x+2>3
-7/5x+2-2>3-2
-7/5x>1
-7/5x *-5/7>1*-5/7
X>-5/7
H
-1/5x+1/5<0
5(-1/5x+1)<0
-x+1<0
-x+1-1<-1
-x<-1
X<1