Ответы
Ответ : 4 смотрите на фото
![](https://st.uroker.com/files/af8/af87bd7eb9d02e9634bbe1de445a9168.jpg)
4 1 3 2 5
20:(6 целых 3/14+1 целая 11/14)-(4 целых 1/5-2 целых 3/5):1 целая 3/5=
1.953125
1)6 3 14 + 1 11 14 = 7 + 3 14 + 11 14 = 7 + 3 + 11 14 = 7 + 14 14 = 7 + 1 = 8
2) 4 1 5 - 2 3 5 = 1 + 4·5 5 - 3 + 2·5 5 = 21 5 - 13 5 = 21 - 13 5 = 8 5 = 1·5 + 3 5 = 1 3 5 = 1.6
3) 1.6 - 8= - (8 - 1.6) = - 6.4
4) 20÷6.4 = 20 6.4 = 200 64 = 25 · 8 8 · 8 = 25 8 = 3·8 + 1 8 = 3 1 8 = 3.125
5) 3.125÷1 3 5 = 3 125 1000 ÷1 3 5 = 3 1·125 8·125 ÷1 3 5 = 3 1 8 ÷1 3 5 = 1 + 3·8 8 ÷ 3 + 1·5 5 = 25 8 ÷ 8 5 = 25 8 × 5 8 = 25·5 8·8 = 125 64 = 1·64 + 61 64 = 1 61 64 = 1.953125