bonjour, pourriez vous maider svp : resoudre dans R les équitation ;​

Réponse:

bonjour

1)3x+4=2x+9<=> 3x-2x=9-4<=>x=5

2)2x+3=3x-5<=>2x-3x=-5-3

<=>-x=-8<=> x=8

3)5x-1=2x+4<=>5x-2x=4+1<=> 3x=5<=> x=5/3

4)3x+1=7x+5<=> 3x-7x=5-1<=> -4x=4<=> x=4/-4<=> x= -1

5)5x+8<=> 5x=-8<=> x= -8/5

6)5-4x=0<=> 5=4x<=> x=5/4

7) 5x+2=9x+7<=> 5x-9x=7-2

<=> -4x<=> 5<=> x=5/-4= - 5/4

bonne journée

1) 3x + 4 = 2x + 9

3x - 2x = 9 - 4

x = 5

2) 2x + 3 = 3x - 5

2x - 3x = -5 - 3

-x = - 8

x = 8

3) 5x - 1 = 2x + 4

5x - 2x = 4 + 1

3x = 5

x = 5/3

4) 3x + 1 = 7x + 5

3x - 7x = 5 - 1

-4x = 4

x = -1

5) 5x + 8 = 0

5x = -8

x = -5/8

6) 5 - 4x = 0

-4x = -5

x = 5/4

7) 5x + 2 = 9x + 7

5x - 9x = 7 - 2

-4x = 5

x = -5/4

faut mettre les resultats en S = {x}