Treść zadania

Rozwiązania

• 

  1 0

  sonar 7.10.2012 (22:57)

  1.
  ( 3/4 - 1/5) : 1/2 =
  
  = (15/20 - 4/20) : 1/2=
  
  = 11/20 * 2/1= (skracam 20 z 2)
  
  = 11/10 * 1/1=
  
  = 11/10=
  
  = 1 i 1/10
  
  
  
  
  2.
  3,2 : (0,8 - 2/5 ) =
  
  = 3,2 :(0,8 - 4/10)=
  
  = 3,2 :(0,8 - 0,4)=
  
  = 3,2 : 0,4=
  
  = 8
  
  
  
  
  
  3.
  2/3 * ( 1/2 - 1/6 )=
  
  = 2/3 *(3/6 - 1/6)=
  
  = 2/3 * 2/6= (skracam 2 z 6)
  
  = 1/3 * 2/3=
  
  = 2/9
  
  
  
  4.
  4,8 + 1/3 * (1,2- 0,6)=
  
  = 4 i 8/10 + 1/3 *(1 i 2/10 - 6/10)=
  
  = 4 i 8/10 + 1/3 * 6/10 = (skracam 3 z 6)
  
  = 4 i 8/10 + 1/1 * 2/10=
  
  = 4 i 8/10 + 2/10=
  
  = 4 i 10/10=
  
  = 5
  
  
  
  5.
  (1 - 7/9) * (5,2 - 0,7)=
  
  = 2/9 * 4,5=
  
  = 2/9 * 4 i 5/10=
  
  = 2/9 * 45/10= (skracam 2 z 10 oraz 9 z 45)
  
  = 1/1 * 5/5=
  
  = 5/5=
  
  = 1
  
  
  
  
  6.
  123 : 10 + 0,2 * 6,1=
  
  = 12,3 + 1,22=
  
  = 13,52
  
  
  
  
  
  7.
  (6,5 - 4,7) : ( 4 -2 i 1/5 ) =
  
  = 1,8 : (4 - 2 i 2/10)=
  
  = 1,8 : ( 4 - 2,2)=
  
  = 1,8 : 1,8=
  
  = 1
  
  
  
  
  ( 1,5 - 1 i 1/3) * 2 /25 - 0,2=
  
  = ( 1 i 5/10 - 1 i 1/3) * 2/25 - 2/10=
  
  = (1 i 15/30 - 1 i 10/30) * 2/25 - 2/10=
  
  = 5/30 * 2/25 - 2/10= (skracam 5 z 25 oraz 30 z 2)
  
  = 1/15 * 1/5 - 2/10=
  
  = 1/75 - 2/10=
  
  = 2/150 - 30/150=
  
  = 28/150

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