16. Elimine os parênteses e calcule o valor das expressões a seguir:

a) ( - 20 ) - ( - 10) =
b) ( + 15) + ( - 8 ) - ( - 3 ) + ( + 2 ) =
c) ( - 4 ) x ( - 2 ) - ( - 3 ) =
d) ( - 2 ) ² + ( -3 ) ² =
e) ( + 5 ) - ( + 12 ) + ( + 8 ) - ( - 7 ) + ( -1 ) =​
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