Question

22. Выполните действия:
1)1,35: 2,7 +2,7: 1,35+ (0,4: 2,5). (4,2+130);
3
175
2)(10:23+7,5-10) 40 30 47360
(30
.
+
3) (0,014-12 +0,286:0,6): (-0,025) + 18-
6
3
-105,3:-(-105,3): 10,5-2-2/7.
17
2
4)74,7-105,3:
21

Answer 1

Ответ:

А) 1 1/35 * (7 - 5 4/9) = (1 * 35 + 1)/35 * (7 - (5 * 9 + 4)/9) = 36/35 * (7 - 49/9) = 36/35 * (63/9 - 49/9) = 36/35 * (63 - 49)/9 = 36/35 * 14/9 = (36 * 14)/(35 * 9) = (4 * 2)/5 = 8/5;

Ответ: 8/5.

Б) (4,5 : 1,8 – 1,05) * 2,4 = (45/10 * 10/18 - 105/100) * 24/10 = (50/20 - 21/20) * 12/5 = (50 - 21)/20 * 12/5 = 29/20 * 12/5 = (29 * 12)/(20 * 5) = (29 * 3)/(5 * 5) = 87/25;

Ответ: 87/25.