Question

7 si 8 Va rog imi trebuie repede

Answer 1

7.a) x+1/3 = 5/3
       x = 5/3-1/3
       x = 4/3
   b) x-1/4 = 5/4
       x = 5/4 + 1/4
       x = 6/4 = 3/2
   c) x+5/6 = 1/6
      x = 1/6 - 5/6
      x = -4/6 = -2/3
   d) 1 si3/4 + x = 11/4
      7/4 + x = 11/4
      x = 11/4-7/4
      x = 4/4 = 1
    e) 2 si 2/5 - x = 14/5
      12/5 - x = 14/5
      x = 12/5 - 14/5
      x = -2/5
    f) 15/7 - x = 3 si 2/7
     15/7 - x = 23/7
      x =  15/7 - 23/7 
      x = -8/7

8 a) x+ 1/2 = 3/4
    x = 3/4-1/2 = 3/4-2/4
    x = 1/4
   b) x-1/3 = 7/6
    x = 7/6 + 1/3 = 7/6 + 2/6
    x = 9/6 = 3/2
   c) x+5/9 = 4/3
    x = 4/3 - 5/9 = 12/9 - 5/9
    x = 7/9
   d) 4 si 1/2 + x = 5/6
    x = 5/6 - 4 si 1/2 = 5/6 - 9/2 = 5/6 - 27/6
    x = -22/6 = -11/3
   e) 2 si 3/4 - x = 1/3
     x = 2 si 3/4 - 1/3 = 11/4 - 1/3 = 33/12 - 4/12
    x = 29/12
   f) 3 si 1/5 - x = 1/4
   x = 3 si 1/5 - 1/4 = 16/5 - 1/4 = 64/20 - 5/20
   x = 59/20