Respostas

2013-12-15T16:29:51-02:00
5/7 - [2x(1/3 - 1)]=
5/7 - [2x(-2/3)]=
5/7 - [-4/3]=
5/7 + 4/3=
(15+28)/21 =
43/21


2013-12-15T16:33:03-02:00
5/7 - [2x(1/3-1)]
5/7 - [2x(1/3-1)]          mmc de 3,1 = 3
5/7 - [2x(1/3-3/3)]
5/7 - [2x-2/3]               mmc de 1,3 = 3
5/7 -[6x/3-2/3]
5/7 - 4x/3
5/7 - 4x/3         mmc de 3,7 = 21
28x/7-5/7
23x/7