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Mathematics

Evaluate the following :

(8116)34×[(259)32÷(52)3]\Big(\dfrac{81}{16}\Big)^{-\dfrac{3}{4}} \times \Big[\Big(\dfrac{25}{9}\Big)^{-\dfrac{3}{2}} ÷ {\Big(\dfrac{5}{2}\Big)^{-3}}\Big]

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Answer

Given,

(8116)34×[(259)32÷(52)3]\Big(\dfrac{81}{16}\Big)^{-\dfrac{3}{4}} \times \Big[\Big(\dfrac{25}{9}\Big)^{-\dfrac{3}{2}} ÷ {\Big(\dfrac{5}{2}\Big)^{-3}}\Big]

Simplifying the expression :

(8116)34×[(259)32÷(52)3](1681)34×[(925)32÷(25)3][(23)4]34×[[(35)2]32÷(8125)](23)3×[(35)3÷(8125)](827)×[(27125)÷(8125)](827)×[(27125)×(1258)](827)×(278)1.\Rightarrow \Big(\dfrac{81}{16}\Big)^{-\dfrac{3}{4}} \times \Big[\Big(\dfrac{25}{9}\Big)^{-\dfrac{3}{2}} ÷ {\Big(\dfrac{5}{2}\Big)^{-3}}\Big] \\[1em] \Rightarrow \Big(\dfrac{16}{81}\Big)^{\dfrac{3}{4}} \times \Big[\Big(\dfrac{9}{25}\Big)^{\dfrac{3}{2}} ÷ {\Big(\dfrac{2}{5}\Big)^{3}}\Big] \\[1em] \Rightarrow \Big[\Big(\dfrac{2}{3}\Big)^4\Big]^{\dfrac{3}{4}} \times \Big[\Big[\Big(\dfrac{3}{5}\Big)^2\Big]^{\dfrac{3}{2}} ÷ {\Big(\dfrac{8}{125}\Big)}\Big] \\[1em] \Rightarrow \Big(\dfrac{2}{3}\Big)^3 \times \Big[\Big(\dfrac{3}{5}\Big)^3 ÷ {\Big(\dfrac{8}{125}\Big)}\Big] \\[1em] \Rightarrow \Big(\dfrac{8}{27}\Big) \times \Big[\Big(\dfrac{27}{125}\Big) ÷ {\Big(\dfrac{8}{125}\Big)}\Big] \\[1em] \Rightarrow \Big(\dfrac{8}{27}\Big) \times \Big[\Big(\dfrac{27}{125}\Big) \times {\Big(\dfrac{125}{8}\Big)}\Big] \\[1em] \Rightarrow \Big(\dfrac{8}{27}\Big) \times \Big(\dfrac{27}{8}\Big) \\[1em] \Rightarrow 1.

Hence, (8116)34×[(259)32÷(52)3]=1\Big(\dfrac{81}{16}\Big)^{-\dfrac{3}{4}} \times \Big[\Big(\dfrac{25}{9}\Big)^{-\dfrac{3}{2}} ÷ {\Big(\dfrac{5}{2}\Big)^{-3}}\Big] = 1.

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