Respostas

2014-03-12T13:47:14-03:00

17-{3.(5)-2.25+[9.5-8.(3)]}
17-{3.5-2.25+[9.5-8.3]}
17-{3.5-2.25+21}
17-{15-50+21}
17-{-35+21}
17-{-14}
31