Respuestas

2013-08-12T15:54:28+02:00
1) - 3.25151515...
        = - 3 - (2515 - 25)/9900
        = - 3 - 2490/9900
        = - 3 - 249/990
        = [- 3(990) - 249]/990
        = - (2970 + 249)/990
        = - 3219/990
 - 3.25151515...   = - 1073/330

2) - 0.25
      = - 25/100
  - 0,25 = - 1/4
3) 1.8888...
   = 1 + 8/9
   = (9 + 8)/9
1.8888 = 17/9

4) 2.3 = 23/10
       
5) 0.008
     = 8/1000
  0.008 = 2/250

6) 0.00033..
    = (00033 - 000)/99900
    = 10^-3x33/99
    = 10^-3x11/33
    = 11/33000
  0.00033 = 11/33300