688.
2)5а-(0,7а+8);
4)9,6b+(7-0,4b);
6)-5c+(13-6c).
SadPlayer007
1
12.12.2021 12:44
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1
2) 5а-(0,7а+8)= 5а-0,7а-8=4,3а-8
4)9,6b+(7-0,4b)=9,6b+7-0,4b=9,6b-0,4b+0,7=9,2b+0,7
6) -5c+(13-6c)=-5c+13-6c=-5c-c+13=-6c+13