Resposta:
2-{-12+[17-(-12+10)-3]}
2-{-12+[17-(-2)-3]}
2-{-12+[17 + 2 - 3]}
2-{-12+[16]}
2-{-12+16}
2-{4}
2 - 4 = - 2
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Resposta:
2-{-12+[17-(-12+10)-3]}
2-{-12+[17-(-2)-3]}
2-{-12+[17 + 2 - 3]}
2-{-12+[16]}
2-{-12+16}
2-{4}
2 - 4 = - 2