Răspuns:
6/(√5+3)-2√5/(√5-3)
=[6(√5-3)-2√5(√5+3)]/[(√5+3)(√5-3)]
=(6√5-18-2×5-6√5)/(5-9)
=(-18-10)/(-4)
=(-28)/(-4)
=28/4
=7
