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Sagot :

INEQUATION

Bonjour,

a) 10+3x= 16

3x= 16-10

x= 6/3

x= 2    S= { 2 }

b)  21x-5= 3x+2

21x-3x= 2+5

18x= 7

x= 7/18     S= { 7/18 }

c)  -7x+2x= 3

-5x= 3

x= -3/5

d)  15-2x= 1-x

-2x+x= 1-15

-x= -14

x= 14

e) 2x+2 < 18

2x < 18-2

x < 16/2

x < 8

S= ] -∞; -8 [

f)  4x-5 ≤ -23+2x

4x-2x ≤ -23+5

2x ≤ -18

x ≤ -9

S= ] -∞; -9 ]

g)  2-x > 3x+26

-x-3x > 26-2

-4x > 24

x < -24/4

x < -6

S= ] -∞; -6 [

h)  3-6x ≥  126-3x

-6x+3x ≥ 126-3

-3x ≥ 123

x ≤ -123/3

x ≤ -41

S= ] -∞; -41 ]

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