If $2x + \frac{2}{x} = 1$,then the value of $x^{3} + \frac{1}{x^{3}}$ is

  • A
    $\frac{13}{8}$
  • B
    $-\frac{11}{8}$
  • C
    $\frac{11}{8}$
  • D
    $-\frac{13}{8}$

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If $\sqrt{x} - \sqrt{y} = 1$ and $\sqrt{x} + \sqrt{y} = 17$,then $\sqrt{xy} = ?$

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$(23.1)^{2} + (48.6)^{2} - (39.8)^{2} = ? + 1147.69$

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If $\frac{x}{y} = \frac{3}{4},$ the ratio of $(2x + 3y)$ and $(3y - 2x)$ is

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