Question

kerjakan himpunan penyelesaian persamaan-persamaan berikut jika variabel pada himpunan bilangan rasional..
1. 2(1/4) + 5(1-y) = 2(1/3-3y)
2.y+3/2-5 = 1-y/2
3.(x-3)/2 = 3-(x+1)/4.

Answer 1

a. 2(1/4) + 5(1-y) = 2(1/3-3y)
   2 + 5-5y = 2/3 -6y
   7 -5y = 2/3 -6y
   -5y +6y = 2/3 -7
   y =-19/3
   y = -6,3
b.y+3/2-5 = 1-y/2
   y-7/2 = 1-y/2
   y+y/2 = 1+7/2
  3y/2 = 9/2
  3y = 9
  y = 9/3
  y = 3
c. (x-3)/2 = 3-(x+1)/4. " perkalian silang"
  4(x-3) = 2(3-x+1)
  4x -12 = 6 - 2x +2
  4x +2x = 6+2+12
  6x = 20
  x =20/6
  x = 3,3

semoga bermanfaat