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( 15 / (√11-√8) ) . ( (√11/√8) / (√11/√8) )
= ( 15 (√11+√8)) / (11-8)
= ( 15 (√11+√8)) / 3
= 5 √11 + 5 √8
h.
( (2√5 + 2√3) / (2√5 - 2√3) ) . ( (2√5 + 2√3) / (2√5 + 2√3) )
= ( 20+8√15+12 ) / 20-12
= ( 32+8√15 ) / 8
= 4 + √15