Ответы на вопрос:
1/ 0.8 (3а-13)-0.6(6а-8)=2.4а-10.4-3.6а+4.8=-1.2а-5.6 а= -3 1/12=-37/12, то -1.2*(-37/12)-5.6=-12/10*(37/12)-56/10=37/10-56/10=-19/10=-1.9 2/ 6 5/9 (n-9)+2 2/9(18-n)=59/9n-59+40-20/9n=39/9n-19 n=0.3 39/9*3/10-19=39/30-19=13/10-19=1.3-19=-17.7 3/ 8/9(2 1/4a-3/4в)-7/30(4 2/7а-8 4/7в) = 8/9*9/4a - 8/9*3/4b- 7/30* 30/7a +7/30*60/7b = 2а-2/3в-а+2в=а+4/3в=а+1 1/3в
Популярно: Математика
-
DekenS102.01.2020 05:27
-
sofarik345628.08.2020 07:04
-
lesyastruklol13.01.2021 06:03
-
dilmurod929219.05.2021 22:24
-
Osdit25.02.2022 09:34
-
allapogorelayaoxd0fz05.04.2022 03:47
-
keril110121.06.2020 19:53
-
loxsanya201703.04.2021 00:05
-
MrsDrew03.07.2020 21:57
-
kektuber222owf6bv05.05.2021 06:29