1/3(68.64+42)×3.3-2×112.99/3
    1/3(68.64+42)×3.3-112.99/3
    1/3×68.64×3.3-86.08
    1/3(68.64+42)×3.3-86.08×2/3
    1/3(68.64+42)×3.3-86.08/3
    0.067×68.64×3.3+0.200×42×3.3=
    -0.267×68.64×3.3-0.311×42×3.3
    0.244×68.64×3.3+0.289×42×3.3
    11.25×2.5
    37.45+14.72
    14.98×2.5
    28.93/(360×0.973×200)
    21.04/(360×0.9815×180)
    21.04/（360×0.9815×180）
    1-0.5×0.054
    1-0.5×0.037
    0.054×100×200×1×9.6/360
    1×9.6×1300×100×(200-0.5×100)
    1-√(1-2×0.053)
    1-√(1-2×（-0.038）)

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