2/7 :8 + 5/0,7 - 3/4 :21 = 7целых 1/7
1) 2/7 : 8 = 2/7 * 1/8=2/56=1/28
2) 5 : 7/10 = 5 * 10/7 = 50/7
3) 3/4 : 21 = 3/4 * 1/21=1/28
4) 1/28 + 50/7 = 1/28 + 200/28 = 201/28
5) 201/28 - 1/28 = 200/28 =50/7 = 7 целых 1/7
Ответ:
Пошаговое объяснение:
100*180:45-1256*14:100=224,16
536*78:100+453*87:100=812,19
(4.71-8.9) + (8.9-4.71)=4.71-8.9 + 8.9-4.71=0<span>
(6 13/18-4.2)-(2 7/18 -1.2)=</span>6 13/18-4.2-2 7/18 +1.2=4 6/18-3=1 6/18=1 1/3<span>
(5.9+3.1)-(5.9-3.1)=</span>5.9+3.1-5.9+3.1=6.2<span>
-8 11/13-(2/3-11/13)=</span>-8 11/13-2/3+11/13=-8 -2/3=-8 2/3
Применена формула квадрата суммы