Without actually calculating the cubes,find the value of:
$(0.2)^{3} - (0.3)^{3} + (0.1)^{3}$

  • A
    $0.018$
  • B
    $-1$
  • C
    $1$
  • D
    $-0.018$

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If $\frac{x}{y}+\frac{y}{x}=-1$ $(x, y \neq 0)$,the value of $x^{3}-y^{3}$ is

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