(4/9)6 x (4/9)-4 simplify without law of exponents
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=(4/9)^6×(4/9)^-4
={(4×4×4×4×4×4)/(9×9×9×9×9×9)}×{(9×9×9×9)/. (4×4×4×4)}
=(4×4×)/(9×9})
=16/81
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