Efetuar as operações: a) 12√30 : 6√15 = √12².30 : √6².15 = √4320:540 = 18 (Está correto?)

b) 10√5 . 2√3 = √10².5 . √2².3 = √100.5 . √4.3 = √500.12 = 6000 (
Está correto?)

c) 3∛2 . 3∛5 = ∛3².2 . ∛3².5 = ∛9.2 . ∛9.5 = ∛18.45 = 810
(é isso?) 

d) 20 raiz quadrupla√8 / 5 raiz quadrupla√2 = raiz quadrupla√20².8 / raiz quadrupla√5².2 = raiz quadrupla√400.8 / raiz quadrupla√25.2 = raiz quadrupla√3200 / raiz quadrupla√50 (é isso?)
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