a) 20,5 - 1,1 × (0,4 + 0,2)
b) 6 : [1,2 • (7,9-2,9)] + (0,1)³
c) 2 • {1,2 : [2 • (5,6 - 5,1)]} + (0,2)²

preciso p hj​
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