Question

AJUTOR!!! AM NEVOIE PE MAINE
Calculati:a)2x+1/3=1/2+x
b)2[3(x-4)-4(x+1)]=8x-3(9+5x)
c)2x-1/3-x-5/2=5x+8/6-2x-7/2
d)2x-7/6-3(x-1)=2x+1/15+1-2x/30

Answer 1

a) 2x - x = 1/ 2 - 1/3
   x = 3 - 2 / 6 , numitorul este 6
   x = 1 /6
b) 2( 3x - 12 - 4x - 4) = 8x - 27 - 15x
   2( - x - 16) = - 7x - 27
   - 2x - 32 = - 7x - 27
   - 2x + 7x = 32 - 27
   5x = 5
   x = 5/5
   x = 1
c) 2x - x - 5x + 2x = 8/6 - 7/2 + 1/3 + 5/2
   x - 3x = 8/6 + 1/3 - 2/2
   - 2x = 4/3 + 1/3 - 1, numitorul comun= 3
   - 2x = 5/3 - 1
   - 2x = 5/3 - 3/3
   - 2x = 2/3
     x = - 2/3 : 2
     x = - 2/3 · 1/2
     x = - 2/6
     x = - 1/3
d)  2x - 7/6 - 3x + 3 = 2x + 1/15+ 1 - x/15
     - x - 7/6 + 3 = 2x - x/15 + 1/15 + 1
     - x - 2x + x/ 15 = 1/ 15 + 1 + 7/6 - 3
     - 3x + x/ 15 = 1/15 + 7/6 - 2, numitorul comun  = 30
     - 90x + 4x = 4  + 35 - 60
       - 86 x = 39 - 60
       - 86x = - 21
       x = 21/86