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A) 5•7 = 35
8•9 = 72
B) 72 = 2³•3²
48 = 2⁴•3
36
20 = 2•10
30 = 3•10
10
C) 23, 41, 47 y 79 son primos
27 = 3³
63 = 3²•7
81 = 3⁴
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