Question

решите пример
4 целых 2/3 - 5/9 * 2 целых 4/7
---------------------------------------------- + 0,8 * 1,25
(2 целых 1/7 + 1 целых 2/3) :5

Answer 1

       .................=5 1/4=5,25

1)   5/9 * 2 4/7=5/9 * 18/7=10/7=1 3/7
2)   4 2/3 - 1 3/7=4 14/21 - 1 9/21=3 5/21
3)   2 1/7+1 2/3=2 3/21+1 14/21=3 17/21
4)   3 17/21 : 5=80/21 * 1/5=16/21
5)   3 5/21 : 16/21=68/21 * 21/16=17/4=4 1/4
6)   0,8*1,25=1
7)   4 1/4+1=5 1/4=5,25