Treść zadania

Najlepsze rozwiązanie

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  turtle 7.9.2011 (21:51)

  zad 2.
  a) 1/4+1/5 = 5/20+4/20 = 9/20
  b) 2/3+5/7 = 14/21 + 15/21 = 29/21 = 1 i 8/21
  c) 1 1/10+5 4/5 = 11/10 + 29/5 = 11/10 + 58/10 = 69/10
  d) 5/6+3 11/12 = 10/12 + 47/12 = 57/12
  e) 1/4+1/5+3/10 = 5/20 + 4/20 + 6/20
  f)5+7 8/9 +4 1/2 = 90/18 + 71/9 + 9/2 = 90/18 + 142/18 + 81/18 = 313/18
  
  zad 4.
  a) 6/7-3/4 = 24/28 - 21/28 = 3/28
  b)12/13 - 2/5 = 60/65 - 26/65 = 34/65
  c)1 2/3-1/6 = 5/3 - 1/6 = 10/6 - 1/6 = 9/6 = 3/2
  d) 2 1/2-1 3/4 = 5/2 - 7/4 = 10/4 - 7/4 = 3/4
  e) 12 7/10-8 7/8 = 127/10 - 71/8 = 508/40 - 355/40 = 153/40
  f) 4 7/9-2 11/12 = 43/9 - 35/12 = 172/36 - 105/36 = 67/36
  
  zad 6.
  a) 2 2/3*3 3/4 = 8/3 * 15/4 = 30/3 = 10
  b) 12 4/5*2 3/16 = 64/5 * 35/16 = 28
  c) 4/21*7/12*3/5 = 4/3 * 1/12 * 3/5 = 1/15
  d) 9/14*10/11*22/45 = 9/7 * 5/1 * 2/45 = 10/35 = 5/7
  e) 1 1/2* 1 1/3*1 1/4 = 3/2 * 4/3 * 5/4 = 5/2
  f)18*5/9*2 2/3 = 18 * 5/9 * 8/3 = 18 * 40/27
  
  i ostatnie zad.9
  a) 5 3/4:1 7/16 = 23/4 : 23/16 = 23/4 * 16/23 = 4
  b)12 5/6: 4 7/12 = 77/6 : 55/12 = 77/6 * 12/55 = 7/1 * 2/5 = 14/5
  c) 2 2/5: 4 1/6 = 12/5 : 25/6 = 12/5 * 6/25 = 2/1 * 1/5 = 2/5
  d) 10 5/8: 8 1/2 = 85/8 : 17/2 = 85/8 * 2/17 = 5/4 * 1 = 5/4
  e) 2 5/14:1 4/7 = 33/14 : 11/7 = 33/14 * 7/11 = 3/2
  f) 3 /34 :12 1/2 = 3/34 : 25/2 = 3/34 * 2/25 = 3/(17*25)
  
  Nie gwarantuję, że się po drodze nie pomyliłam.

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