20:2=10 сек (одна игрушка)
10*15=150(сек)- 1 мин 30 сек
(7/22+28/22):10/33=
35/22:10/33=
35/22*33/10=
21/4=5 1/4
-(-8,5 - 3 3/20 + 6 4/15) - 1/3 = 8,5 + 3 3/20 - 6 4/15 - 1/3 = 5 1/20
1) 8,5 + 3 3/20 = 8 5/10 + 3 3/20 = 8 10/20 + 3 3/20 = 11 13/20
2) 11 13/20 - 6 4/15 = 11 39/60 - 6 16/60 = 5 23/60
3) 5 23/60 - 1/3 = 5 23/60 - 20/60 = 5 3/60 = 5 1/20
24:17=48:34
24*34=816
17*48=816
А - [0,25]
В - [1,5]
С - [0,5]
D - [1,25]