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Sagot :

MAUDMARINE

Bonjour,

Calculer les expressions suivantes :

a-) 2x+1:2=3

2x = 3 - 1/2

2x = 2,5

x = 2,5/2

x = 1,25

b-) x:2+5=5:6

x/2 = 5/6 - 5

x/2 = 5/6 - 30/6

3x/6 = - 25/6

3x = - 25

x = - 25/3

c-) 2x+3:4=5:2

2x = 5/2 - 3/4

8x/4 = 10/4 - 3/4

8x = 7

x = 7/8

d-) -3x-1:2=7:4

- 3x = 7/4 + 1/2

- 12x/4 = 7/4 + 2/4

- 12x = 9

x = - 9/12

x = - 3/4

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