Question

7 ( x - 1 ) < 5 - 2 x

10 x - 1 < 4 ( x + 1 )

3 ( x - 2 ) < 5 x - 8

6 x - 3 ( 4 - 2 x ) > 0

Answer 1

a
7( x - 1) < 5 - 2x
7x - 7 < 5 - 2x
7x + 2x < 5 + 7
9x < 12
x < 12/9 ou  4/3 **
b
10x - 1 < 4 ( x + 1)
10x - 1 <4x + 4
10x - 4x < 4 + 1
6x < 5
x < 5/6 ****

c
3 ( x - 2 ) < ( 5x - 8)
3x - 6 < 5x - 8
3x - 5x < -8 + 6
-2x < -2
2x > 2
x > 2/2 ou 1  ****

d
6x - 3( 4 - 2x)  > 0
6x - 12 + 6x > 0
12x > 12
x > 1 ****