Easy
Rewrite the expression 1b27\frac{1}{b^{\frac{2}{7}}}b721 in the form bnb^{n}bn.
b−27b^{-\frac{2}{7}}b−72
b27b^{\frac{2}{7}}b72
b72 b^{\frac{7}{2}}b27
b−72b^{-\frac{7}{2}}b−27
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