Question

determine o valor das expressões (13-28)_9•(-5)-[(-31+55)÷(19-43)+3•(17-18)-9]​

Answer 1

(13-28)-9•(-5)-[(-31+55)÷(19-43)+3•(17-18)-9]

-15+45 [-24÷(-24)+3.(-1)-9]

-15+45 [1 - 3 - 9]

-15 + 45 + 1 - 3 - 9

30 + 1 - 12

31 - 12

19