Respostas

2014-03-29T10:21:13-03:00
10y -5( 1+y)-3(2y-2)-20
10y-5-5y-6y+6-20
-1y-19

att: gleice andrade
2014-03-29T10:22:56-03:00
10y-5(1+Y)-3(2y-2)-20
10y - 5 - 5y - 6y + 6 - 20
10y - 5y - 6y - 5 + 6 - 20
-y - 19
2 4 2