81^x/4 × 3^3x / 3^x × 3^3x-1
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3^ 4x/4 × 3^3x / 3^x × 3^3x - 1
= 3^x + 3x / 3^4x - 1
= 3^ x + 3x - 4x + 1
= 3 ans.
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