13.a al to The value of 708 (A) 31/3 + 1 9113_3113 +1 (B) 31/3 – 1 (C) 31/3 + 2 (D) 31/3 - 2

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( begin{aligned} frac{4}{3^{2 / 3}-3^{1 / 3}+1} &=frac{4left(3^{1 / 3}+1right)}{left(3^{1 / 3}+1right)left(3^{2 / 3}-3^{1 / 3}+1right)} frac{4left(3^{1 / 3}+1right)}{left(3^{1 / 3}right)^{3}+1^{3}} &=frac{4left(3^{1 / 3}+1right)}{4} end{aligned} )

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