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  sonar 29.9.2010 (21:29)

  1/2 :4/5 - 2/3 :4/6 = 1/2 * 5/4 - 2/3 * 6/4 = 5/8 - 12/12 = 5/8 - 1 = - 3/8
  
  3/4 : 3/5 + 1/2 : 6/8=3/4 * 5/3 + 1/2 * 8/6 = 15/12 + 8/12 = 23/12 = 1 i 11/12
  
  4/6 : 7/9 - 1/2 : 1/4=4/6 * 9/7 - 1/2 * 4/1 = 36/42 - 4/2 = 6/7 - 2 = - 1 i 1/7
  
  8/9: 1/3 + 2/3 : 1/2=8/9 * 3/1 + 2/3 * 2/1 = 24/9 + 4/3 =2 i 6/9 + 4/3 = 2 i 2/3 + 4/3 = 4
  
  5/7: 2/3 - 1/2 :1:9= 5/7 * 3/2 - 1/2 * 9/1 = 15/14 - 9/2 = 1 i 1/14 - 4 i 1/2 =1 i 1/14 - 4 i 7/14 = - 3 i6/14 =-3 i 3/7
  
  4/7:1/8 + 3/5: 6/7=4/7 * 8/1 + 3/5 * 7/6 = 32/7 + 21/30 = 32/7 + 7/10 = 320/70 + 49 /70 = 369/70= 5 i 19/70
  
  3/6:1/8 - 5/7: 2/3=3/6 * 8/1 - 5/7 * 3/2 = 24/6 - 15/14 = 4 - 1 i 1/14= 2 i 13/14
  
  3/5:5/7 +3/5 :1/2=3/5 * 7/5 + 3/5 * 2/1 = 21/25 + 6/5 = 21/25 + 30/25 = 51/25 = 2 i 1/25
  
  3/4:6/9 - 3/4:1/2= 3/4 * 9/6 - 3/4 * 2/1 = 27/24 - 6/4 = 9/8 - 12/8 = -3/8
  
  3/6:7/9 + 2/5:3/9=3/6 * 9/7 + 2/5 * 9/3 = 27/42 + 18/15= 9/14 + 6/5 = 45/70 +84 /70 = 129/70 = 1 i 59/70
  
  4/6 :3/8 - 3/4 : 7/8=4/6 * 8/3 - 3/4 * 8/7 = 32/18 - 24/28 = 16/9 - 6/7 = 112/63 - 54/63= 58/63
  
  5/7:3/5 + 2/5:4/9= 5/7 * 5/3 + 2/5 * 9/4 = 25/21 + 18/20 =500 /420 + 378/420 = 878/420 =2 i 38/420 =2 i 19/210

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