Question 539497
{{{(2ab+2ac+4a^2)/(4b+4c+8a)}}}
{{{2a(b+c+2a)/4(b+c+2a)}}}
{{{(2a(b+c+2a))/(2*2(b+c+2a))}}}
{{{(cross(2)a(cross(b+c+2a)))/(2*cross(2)cross(b+c+2a))}}}
{{{a/2}}}