Respostas

2014-03-11T19:45:45-03:00
2/5 x 1/4 = 1/20
1/20 - 1/10 = 1-2/20 = -3/20
2/5 *1/4-1/10
Desculpe,escrevi no campo errado.
2014-03-11T19:49:51-03:00
2/5 *1/4 - 1/10=
2/20-1/10=
(2-1)/10=1/20