360×2212×(600-60-60)
    360×1810×(600-80-80)
    0.518×520
    (360×1810-360×804)/(1×14.3×450)
    0.20%×40000×520
    0.20%×510000
    π/0.203
    4×3×10^7×1387058×10^(-8)
    1.15×2465.98
    7034.86/(1.15×(1-〖0.30〗^2 )×2.726)
    (1-(2×〖0.30〗^2)/(1-0.30))×9.47×10^3
    68220.81/4400
    161424.2/(2×4400)
    400×11
    161424.2/(80×62)
    (161424.2×(180^2+0.25×80^2 ))/(80×16×(180^2-0.25×80^2 ) )
    (161424.2×2.3)/((400-80)×30)
    60.48/84.5
    60.48/67.5
    1.1×1.0×（53.2/1.0+0.1+0.08+1.1+0.5）

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