y=2x

Find the intersection of two straight lines b (1, 2).

(2) Let y=0 to get the intersection of the straight line y=( 1/2)x+ 1/2 and the x axis A (-1, 0),

Let x = 0, and the intersection of the straight line y=( 1/2)x+ 1/2 and the y axis c (0, 1/2).

So IOAI= 1, IOCI= 1/2.

According to Pythagorean theorem, IACI= = (root number 5)/2.

So xinbao =IOCI/IACI

=( 1/2)/[ (root number 5)/2]

= 1/ (root number 5)

= (root number 5)/5.