Respostas

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2014-05-29T19:34:00-03:00
5a + 2b + c
5.2 + 2.1 + 7
10 + 2 + 7
12 + 7
19
2 5 2
2014-05-29T19:35:16-03:00
5.2(a) + 2.1(b) + 7(c)
10 + 2 + 7= 19