Report - cdigital.dgb.uanl.mxcdigital.dgb.uanl.mx/la/1020124714/1020124714_008.pdf · = 1-a2+6a+7} = 10+3a2-18a-21 - 3a2-18a-11 EŽirniaa signos de agrupación y reduce a terminos semejantes.

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