Resolva as expressões numéricas

a) 27 + { 14 + 3 x [ 100 : (18 - 4 x 2) + 7 ] } : 13

b) 3 . [ 43 - [ 5 . 60 + 7 . ( 92 - 80 )]}

c) ( 1/3 )2 x 3/10 : ( - 1/3 + 1)

d) ( -5 + 2 ) 2 : ( -9 ) - [ 2 . ( -4 -2 ) - (-1)3 ]


Preciso da explicação além do resultado.
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