Respostas

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2014-08-21T22:58:24-03:00
A-1 = 0 ----> a =1;

2a - b + 3 =0----> 2-b+3=0------> b=5

b - c = 0 ---->  b = c = 5

c - 2d = 0 ----> -2d = -5 ----> 2d = 5 ---> d = 5/2.
1 5 1