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30(√3-√5-√2)/(√3-√5)²-2)=30(√3-√5-√2)/(3-2√15+5-2)=30(√3-√5-√2)/(6-2√15)=
30(√3-√5-√2)(6+2√15)/(6-2√15)(6+2√15)=
30(√3-√5-√2)(6+2√15)/(36-60)=30(√3-√5-√2)(6+2√15)/(-24)=
5(-√3+√5+√2)(6+2√15)/(4)
3/∛9-∛6+∛5=
3( (∛9-∛6)²-∛9-∛6)∛5+∛25)/(∛9-∛6+∛5)[(∛9-∛6)²-(∛9-∛6)∛5+∛25)]=
3( (∛9-∛6)²-∛9-∛6)∛5+∛25)/(∛9-∛6)³-5
3/∛9-∛6+∛5=(3-∛54+∛45)/∛9=(3∛3-3∛6+3∛5)/3=∛3-∛6+∛5