evaluate {(1/3) power-3-(1/2) power -3} ÷ (1/4) -3
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( 1/3)^-3 - (1/2)^-3 ÷ (1/4)^-3
= 3^3- 2^3 ÷ 4^3
= 27-8 ÷ 64
=19/64
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