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² log 5 x ⁵ log 64 = ² log 64 = 6
b)
³ log 6 x ⁶ log 81 = ³ log 81 = 4
c)
⁵ log 7 x ⁷ log 49 = ⁵ log 49 = 2 x ⁵ log 7
d)
³ log 9 x ³ log 81 = 2 x 4 = 8