81. (0.04)2 ÷ (0.008) × (0.2)6 = (0.2)?
82. The value of $$\frac{{{{\left( {243} \right)}^{0.13}} \times {{\left( {243} \right)}^{0.07}}}}{{{{\left( 7 \right)}^{0.25}} \times {{\left( {49} \right)}^{0.075}} \times {{\left( {343} \right)}^{0.2}}}}$$ is = ?
83. $$\frac{{{2^{n + 4}} - 2 \times {2^n}}}{{2 \times {2^{\left( {n + 3} \right)}}}} + {2^{ - 3}}$$ is equal to = ?
84. $$\frac{{256 \times 256 - 144 \times 144}}{{112}}$$ is equal to = ?
85. $$\sqrt {3\sqrt {3\sqrt {3........} } } $$ is equal to = ?
86. The value of $$\frac{{{2^{n - 1}} - {2^n}}}{{{2^{n + 4}} + {2^{n + 1}}}}{\text{is = ?}}$$
87. If $$x = 5 + 2\sqrt 6 {\text{,}}$$ then $$\sqrt x - \frac{1}{{\sqrt x }}$$ = is?
88. $$\left( {4 + \sqrt 7 } \right),$$ expressed as a perfect square, is equal to = ?
89. If 3x+y = 81 and 81x-y = 3, then the value of $$\frac{x}{y}$$ is = ?
90. $$\left( {\frac{{1 + \sqrt 2 }}{{\sqrt 5 + \sqrt 3 }} + \frac{{1 - \sqrt 2 }}{{\sqrt 5 - \sqrt 3 }}} \right)$$ simplifies to = ?
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