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Anonymous
2/3 x 81 = 54
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(2/3) x (2/3) x (2/3) x (2/3) = (2/3)4 = 16/81
81 times 2 cubed is equal to 648.
negative two-thirds
7.5 divided by 2 2/3 is 2.81 or 2 81/100
4 2/3 x 1/2 is 2 1/3