alguém me ajuda?

a) 92 + ( 2 × 12 ) + ( 36-20) =

b ) 60 -[ 50 + (61 - 4-6)-6] =

c ) 900 - { 70 + [ 150 - ( 80 + 40 - 30 )]} =


com as contas armadas por favor ​
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