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Sagot :

a) x-1/2=2/5

x = 2/5 + 1/2

x = 4/10 + 5/10

x = 9/10

 

b) 2x=9/14

x = 9/28

 

c) 7y+5=8-10y

7y + 10y = 8 - 5

17y = 3

y = 3/17

 

d) 3(x-3)+4=4x+1

3x - 9 + 4 = 4x +1

3x - 4x = 1 + 5

-x = 6

x = -6

 

En espérant t'avoir aidé

le a il est bon 

 

b)  2x=9/14

     x=(9/14)/2

     x=9/28

 

c) 7y+5=8-10y

    7y+10y=8-5

    17y=3

    y=3/17

 

d) 3(x-3)+4= 4x+1

    3x-9+4=4x+1

    3x-4x=1-4+9

    -1x=6

    x=6/-1 = -6

 

voila 

FIN

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