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= ²log 3³· ³log 2⁸ - ⁷log 7⁻¹= (3). ²log 3· (8) ³log 2 - (-1) ⁷log 7
= (24).²log 3·³log 2 + ⁷log 7
= 24 (²log 2) + 1
= 24 + 1
= 25