$21.9 \%$ of $(511.987 - 42.49) = \frac{?}{5.5}$

  • A
    $440$
  • B
    $450$
  • C
    $380$
  • D
    $300$

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$(0.25)^{6} \div (0.125)^{2} \times (0.5)^{4} = (0.5)^{?+3}$

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