calcule as expressões a seguir:
a) (- 4 + 40 ) : (-8)
b) ( - 6 - 14 ) : (- 6 + 1 )
c) ( - 8 ) * ( + 3 ) - ( - 15 ) : ( + 3 )
d) [-8+ (-4) * (-3)] : (- 1 - 1 )
pfv me ajuda
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