December 2018 2 17 Report
Marta resolvió un polinomio aritmético en la siguiente hoja cometiendo algunos errores, señala cada uno de los errores y corrígelos.

{[(−3 + (−4))] + [−(20 + (−4) + 7) − 6] − 1} = {[(−3 − 4)] + [−20 − 4 + 7 − 6] − 1} = −7 − 23 + 1 = −29
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