Respuestas

2012-09-21T23:24:06+02:00

{12 - c[-( -5)] - (4a + 5b) + 6d (-b + 3c)} + 1/2a =>   


{12 -c[+5] -4a - 5b - 6bd + 18dc} + 1/2a  =>


12 -5c -4a - 5b - 6bd + 18dc + 1/2a =>


12 - 5(1/2) - 4(3) - 5(-5) - 6(-5 x 2) + 18(2 x 1/2) + 1/6  =>


12 - 2,5 - 12 + 25 + 60 + 18 + 1/6 = 302/3