Question

Completati:
1) (1 intreg si 3/5+2 intregi si 1/5):1 intreg si 9/10
2) (1 intreg si 7/10-4/5):3/7
3) 6 integi si 1/4:(3 intregi si 2/3-1 intreg si 1/5)
4) (4 intregi si 1/2-1 intreg  si 2/7*2 integi 1/3)
5) (1 intreg 5/6-1 intreg si 1/5)*3 intregi

Answer 1

1) (1 3/5 + 2 1/5) : 1 9/10 =
  = (8/5 + 11/5) : 19/10
  = 19/5 : 19/10
  = 19/5 x 10/19
  = 2
2) (1 7/10 - 4/5) : 3/7 =
   = ( 17/10 - 4/5 ) : 3/7
   = ( 17/10 - 8/10 ) : 3/7
   = 9/10 : 3/7
   = 9/10 x 7/3
   = 21/10
3) 6 1/4 : ( 3 2/3 - 1 1/5 ) =
   = 25/4 : ( 11/3 - 6/5 )
   = 25/4 : ( 55/15 - 18/15 )
   = 25/4 : 37/15
  = 25/4 x 15/37
  = 375/148
4) ( 4 1/2 - 1 2/7 x 2 1/3 ) =
   = 9/2 - 9/7 x 7/3
  = 9/2 - 9/3
  = 27/6 - 18/6
  = 9/6
  = 3/2
5) ( 1 5/6 - 1 1/5 ) x 3 =
   = ( 11/6 - 6/5 ) x 3
   = ( 55/30 - 36/30 ) x 3
   = 19/30 x 3
   = 19/10
6) 2 5/6 x 4/15 + 2 1/6 x 4/15 =
   = 17/6 x 4/15 + 13/6 x 4/15
   = 4/15 ( 17/6 + 13/6 )
   = 4/15 x 30/6
   = 4/3
7) 3 2/3 x 1 1/2 - 1 2/3 x 1 1/2 =
   = 11/3 x 3/2 - 5/3 x 3/2
   = 3/2 ( 11/3 - 5/3 )
   = 3/2 x 6/3
   = 3
8) 7 - 1 1/3 x 3 3/4 =
   = 7 - 4/4 x 15/4
   = 7 - 5
   = 2
9) ( 2 1/2 + 1 1/3 ) : 1/6 =
   = ( 5/2 + 4/3 ) : 1/6
   = ( 15/6 + 8/6 ) : 1/6
   = 23/6 : 1/6
   = 23/6 x 6/1
  = 23
10) ( 1 3/5 + 2 1/5 ) : 1 9/10 =
     = ( 8/5 + 11/5 ) : 9/10
     = 19/5 : 19/10
     = 19/5 x 10/19
     = 2