Question

12+7,8x(8,1-8,4)
-6-4,5x(5,2-10,6)

Answer 1

12+7.8*8.1-7.8*8.4-6-4.5*5.2-4.5*10.6
12+63.18-65.52-6-23.4-47.4
9.66-6-23.4-47.4=-67.14

Answer 2

надо упростить 12+7.8х8.1-7.8х8.4
12+(63.18-65.52)
12+63.18-65.52
75.18-65.52
9.66


2 пример:

-6-4.5х(5.2-10.6)
-6-4.5х5.2-4.5х10.6
-6-(23.4-47.7)
-6-23.4+47.7
-29.4+47.7
18.3

Answer 3

хотя не сказано