2178-5201 2178-5201 S2178-52012016000200165 10.4025/actascieduc.v38i2.25734 Brazil 00 06 2016 00 06 2016 38 2 165 172

18 51 51 7-10 23 1 1 45-67 42 1/2 1/2 227-40 18 51 51 21-30 8 16 16 20-45