1.543×108\frac{1.54}{3 \times 10^{8}}3×1081.54
3×108×1.541.33\frac{3 \times 10^{8} \times 1.54}{1.33}1.333×108×1.54
3×1081.5\frac{3 \times 10^{8}}{1.5}1.53×108
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