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Expressões numéricas

A) [( -19 + 6 - 3.8) + 24 ÷ 8 + 9] =

B) 17 + 13 - 32 ÷ 4 + (19.2 - 64 ÷ 4) + 7.5 =

C) [( 9 + 15.3 - 49 ÷) + 42 - 8] .2 - 30

D) { 84 - [ 56 + ( 3.8 ) ÷ ( 2 + 4 + 1 )] } .2 =
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