Ответы на вопрос:
(0,8а+0,3b)(0,6b-1,2а) если a = 2 1/12 = 25/12 , b = -1 1/9 = -10/9 (8/10*25/12+3/10) * (-10/9)* (6/10*(-10/9)-12/10*25/12) = (5/3-1/3) * (-2/3 - 5/2)= 4/3*(-19/6) = -38/9 = -4 2/9
(42 5/7 - 4 2/3) - (23 - 15 9/14) = 30 29/42
1) 42 5/7 - 4 2/3 = 42 15/21 - 4 14/21 = 38 1/21
2) 23 - 15 9/14 = 22 14/14 - 15 9/14 = 7 5/14
3) 38 1/21 - 7 5/14 = 38 2/42 - 7 15/42 = 37 44/42 - 7 15/42 = 30 29/42
ответ: 30 целых 29/42.
Популярно: Математика
-
mdasa737531.12.2020 18:09
-
Kristina1605lps12.09.2021 11:47
-
rmnikkp00szv01.03.2022 08:22
-
Полина2035116.12.2020 01:22
-
Pyc5214129.03.2021 19:37
-
marina0710215.03.2022 14:00
-
pomogiteplease124526.01.2022 23:38
-
Yaroslav164010.03.2023 15:48
-
qvr3k18.05.2022 02:17
-
ТашаФедоренко24.08.2020 04:36