Resposta:
20-[6-4×(10-3²)+1=
20-[6-4×(10-9)+1=
20-[6-4×1+1]
20-[6-4+1]
20-3
17
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Resposta:
20-[6-4×(10-3²)+1=
20-[6-4×(10-9)+1=
20-[6-4×1+1]
20-[6-4+1]
20-3
17