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(64/729)-1/3 =?

Question 1:

(64/729)-1/3 =?

A. -4/9

B. 8/9

C. 8/27

D. 2^1/4

Feedback (4^3/9^3)^-1/3
= (4/9)^-1
= 9/4
= 2^1/4

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