Question 377433
{{{4/(5-sqrt(10))=(4/(5-sqrt(10)))*((5+sqrt(10))/(5+sqrt(10)))}}}
{{{4/(5-sqrt(10))=(20+4sqrt(10))/(25+5sqrt(10)-5sqrt(10)-10)}}}
{{{highlight(4/(5-sqrt(10))=(20+4sqrt(10))/(15))}}}