Respostas

2014-08-24T02:19:16-03:00
(5t-3)²= (5t)²+2.5t.3-3²= 25t²-30t+9
(25t²-30t+9).(5t-3)= 125t^3-75t²-150t²+90t+45t-27=1125t^3-225t²+135t-27