(√2+√5-√3)/(2√30-6√2+4√3)
=(√2+√5-√3)/[2(√30-3√2+2√3)]
=(√2+√5-√3)/[2(√30-√18+√12)]
=(√2+√5-√3)/[2√6(√5-√3+√2)]
=1/(2√6)
=√6/(√6*2√6)
=√6/12