91. If a(x + y) = b(x - y) = 2ab, then the value of 2(x2 + y2) is?
92. If $$2x + \frac{1}{{4x}} = 1{\text{,}}$$ then the value of $${x^2} + \frac{1}{{64{x^2}}}$$ is?
93. If $$\sqrt x $$ - $$\sqrt y $$ = 1, $$\sqrt x $$ + $$\sqrt y $$ = 17, then $$\sqrt {xy} $$ = ?
94. If $$\sqrt 3 + \frac{1}{{\sqrt 3 }}{\text{,}}$$ then the value of $$\left( {x - \frac{{\sqrt {126} }}{{\sqrt {42} }}} \right)$$ $$\left( {x - \frac{1}{{x - \frac{{2\sqrt 3 }}{3}}}} \right)$$ is?
95. If $$\frac{{2 + a}}{a}$$ + $$\frac{{2 + b}}{b}$$ + $$\frac{{2 + c}}{c}$$ = 4, then the value of $$\frac{{ab + bc + ca}}{{abc}}$$ is?
96. If $$x + \frac{1}{x} = 5{\text{,}}$$ then the value of $$\frac{{5x}}{{{x^2} + 5x + 1}}$$ is?
97. If $$\frac{1}{a}\left( {{a^2} + 1} \right) = 3{\text{,}}$$ then the value of $$\frac{{{a^6} + 1}}{{{a^3}}}$$ = ?
98. If (x - 5)2 + (y - 2)2 + (z - 9)2 = 0, then the value of (x + y - z) is?
99. If x = 999, y = 1000, z = 1001 then the value of $$\frac{{{x^3} + {y^3} + {z^3} - 3xyz}}{{x - y + z}}$$ is?
100. If $$\frac{a}{{1 - 2a}}$$ $$+$$ $$\frac{b}{{1 - 2b}}$$ $$+$$ $$\frac{c}{{1 - 2c}}$$ = $$\frac{1}{2}{\text{,}}$$ then the value of $$\frac{1}{{1 - 2a}}$$ $$+$$ $$\frac{1}{{1 - 2b}}$$ $$+$$ $$\frac{1}{{1 - 2c}}$$ is?
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