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  Pantera18 19.9.2011 (22:07)

  1) -1 i 5/6+3 i 7/10=-11/6+37/10=-110/60+222/60=112/60=56/30=28/15=1 i 13/15
  2)2 i 3/10-41/25=33/10-41/25=330/100-164/100=166/100=83/50=1 i 33/50
  3)3 i 5/6 - 5 i 2/9 =23/6-47/9=207/54-282/54=-75/54=-1 i 21/54
  4)3/5 - 5/6 - 14/15 =18/30-25/30-14/15=-7/30-14/15=-7/30-28/30=-35/30= -1 i 5/30= - 1 i 1/6
  5)2/3 - 3/10 - 7/20 =20/30-9/30-7/20=11/30-7/20=22/60-21/60=1/60
  6)1/6 - 3/4 - 5/9 = 2/12-9/12-5/9= -7/12-5/9=-63/108-60/108= -123/108= -1 i 15/108
  7)4/15 - 4/9 - 4/25 = 12/45-20/45-4/25= -8/45-4/25= -80/450-72/450=-152/450=76/225
  8)1i 3/4 - 2 i 1/6 - 3 i 2/9 = 7/4-13/6-29/9=21/12-26/12-29/9=-5/12-29/9=-45/108-348/108=-393/108=-3 i 69/108
  9)2 i 1/4 - 3 i 1/10 - 1 i 7/25 = 9/4-31/10-32/25=90/40-124/40-32/25= -34/40-32/25=-340/400-512/400=-858/400=-2 i 58/400= -2 i 29/200
  10)2 i 3/5 - 3 i 2/3 - 1 i 3/10 = 13/5-11/3-13/10= 39/15-55/15-13/10= -16/15-13/10= -160/150-195/150= -355/150= - 2 i 55/150= -2 i 11/30
  11)3 i 3/7 - 4 i 5/21 - 2 i 3/14 = 24/7-89/21-31/14=72/21-89/21-31/14=-17/21-31/14=-34/42-93/42=-127/42= - 3 i 1/42
  12)2 i 1/6 - ( 3 i 3/5 + 1 i 1/3 ) = 13/6-(18/5+4/3)=13/6-(54/15+20/15)=13/6-74/15=195/90-444/90=-249/90=-2 i 69/90= -2 i 23/30
  13)4 i 1/2 - ( 5 i 3/7 - 1 i 3/14 ) = 9/2-(38/7-17/14)=9/2-(76/14-17/14)=9/2-59/14=63/14-59/14=4/14=2/7
  14)3 i 2/15 - ( 1 i 3/10 + 4 i 3/20 ) =47/15-(13/10+83/20)=47/15-(26/20+83/20)=47/15-109/20=376/120-654/120=-278/120=-2 i 38/120= -2 i 19/60
  15)2 i 1/8 - ( 1 i 2/7 - 3 i 1/28 ) =17/8-(9/7-85/28)=17/8-(36/28-85/28)=17/8+49/28=119/56+98/56=217/56=3 i 49/56

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