Treść zadania

Najlepsze rozwiązanie

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  sonar 24.3.2011 (16:09)

  1.
  -3,5 * (-10) + (-10) * 6 =
  = 35 + (- 60) =
  = 35 - 60 = - 25
  
  
  2.
  (2/3 + 0,5) : ( 0,75 - 5/6) =
  = (2/3 + 5/10) : ( 75/100 - 5/6)=
  = ( 2/3 + 1/2 ) : ( 3/4 - 5/6) =
  = ( 4/6 + 3/6) : ( 9/12 - 10/12)=
  = 7/6 : (-1/12)=
  = 7/6 * (-12/1)= (skracam 6 z 12)
  = 7/1 * (-2/1) =
  = - 14/1=
  = -14
  
  
  3.
  0,4 - 2/3 +9 * (-1/4) =
  = 4/10 - 2/3 + (-9/4)=
  = 2/5 - 2/3 - 9/4=
  = 24/60 - 40/60 - 135/60 =
  = -16/60 - 135/60=
  = - 151/60 =
  = - 2 i 31/60
  
  
  4.
  -5/14 + (0,3) x (6/7 - 1) =
  = - 5/14 + 3/10 * (-1/7)=
  = - 5/14 + (- 3/70) =
  = - 25/70 - 3/70 =
  = - 28/70 =
  = - 4/10=
  = - 2/5
  
  
  5.
  -0,75 -2 * (-7/12) + 5/3 =
  = - 75/100 - (- 14/12 ) + 5/3=
  = - 3/4 + 14/12 + 5/3=
  = - 9/12 + 14/12 + 20/12=
  = 25/12=
  = 2 i 1/12
  
  
  6.
  4 i 2/3 * ( - 3,25) - 2 i 2/5 * (-3/4) =
  = 14/3 * (-3 i 25/100 ) - 12/5 * (-3/4) =
  = 14/3 * (- 3 i 1/4) - (-36/20) =
  = 14/3 * (- 13/4) + 36/20= (skracam 14 z 4)
  = 7/3 * (-13/2) + 1 i 16/20=
  = - 91/6 + 1 i 4/5=
  = -15 i 1/6 + 1 i 4/5=
  = - 15 i 5/30 + 1 i 24/30=
  = - 14 i 35/30 + 1 i 24/30=
  = - 13 i 11/30

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