Question

根号5分之10-根号5-1分之5

Answer 1

根号5分之10-(根号5-1)分之5
=10/(√5)-5/(√5-1)
=10√5/5-5(√5+1)/[(√5-1)(√5+1)]
=2√5-5(√5+1)/4
=(8√5-5√5-5)/4
=(3√5-5)/4