Respostas

2013-08-23T19:36:17-03:00
5x - 1 = 7
5x = 8
x = 8/5 
x = 1,6

\sqrt{1,6} =    \sqrt{\frac{16}{10}} =  \frac{4}{ \sqrt{10}}.  \frac{ \sqrt{10} }{\sqrt{10}} =  \frac{4 \sqrt{10} }{10}