Réponses

Meilleure réponse !
2013-04-21T13:03:58+02:00

a)2/3x+1=2

    2/3x = 1 ; x= 3/2

b) 3/10x-4/5 = 7/10

    3/10x = 7/10 + 4/5 = 7/10 + 8/10 = 15/10

     x= 15/10* 10/3  = 150/30 = 15/3 = 5

c) 3/4x-2/3=5/6

     3/4x = 5/6 + 4/6

      x= 9/6 * 4/3 = 36/18 = 2

d) 2/3x+2/5 = 1/2x+2/3

    2/3x-1/2x = 2/3-2/5

    4/6x - 3/6x = 10/15 - 6/15

      1/6x = 4/15

         x = 4/15 * 6 = 24/15 = 8/5