Respostas

2014-03-13T11:41:36-03:00
2014-03-13T12:12:16-03:00
A) 1/3 + 9/6 = 10/9
B) -x/3+1/3 + 9/7 = 1/2
-x/3=-9/-8
8x=-27
x=-27/8
C) -9/4 + 1/3 = x/7
x/7= -8/7
7x=-56
x = -56/7
x = -8
1 5 1