Respostas

2013-09-05T11:31:53-03:00
 \frac{1}{2} / \frac{3}{4} = \frac{2}{7} / \frac{7}{x}
1/2*4/3=2/7*x/7
4/6=2x/14
4/6=x/7
x=4/6*7
x=28/6
x=14/3