Jawabanmu

2014-02-27T10:54:07+07:00
1) 1/2x + 3 = 9
     1/2x = 9-3
      1/2x = 6
       1 = 6 x 2x
       1= 12x
        x=1/12

2)1/3x - 5 =10
     1/3x = 10 + 5
     1/3x = 15
      1 = 15 x 3x
       1 = 45x
       x = 1/45
3)3/4y - 1/5y =2
    (15y-4y)/20 = 2
    11y/20 =2
    11y = 2 x 20
    11y = 40
     y= 40/11= 3 7/11
4)1/x - 1/2 =1/3
    1/x = 1/3 + 1/2
     1/x = (2+3)/6
     1/x = 5/6
      1 = 5/6x
      x= 1 : 5/6
     x = 6/5 = 1 1/5