5根号1/5+根号5/3-1/2根号12/5+根号125
=√5+1/3√15-1/5√15+5√5
=6√5-2/15√15
2根号a-3根号a^2b+5根号4a-2b根号a^2/b
=2√a-3a√b+10√a-2a√b
=12√a-5a√