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b) √36/49 : √81/49 = 6/7 : 9/7 = 6/7 * 7/9 = 6/9 = 2/3
c) √2 i 1/4 * √16 = √9/4 * √16 = 3/2 * 4 = 6
d) ∛3 i 3/8 * ∛64 = ∛27/8 * ∛64 = 3/2 * 4 = 6
e) ∛-0,000064 : ∛-0,000008 = 1/25 : 1/50 = 1/25 * 50/1 = 2