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Octavio
a) 0,12 + 0,24 0,6
b) 4 1/2 + 4 0,2 + 2 3 + 1 0,5
c) (1/2 + 1/3 + 1/5)² × 3/31 21 [2/3 + 2/5 + 2/7] × 1/71
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