1/3(68.64+42)×3.3-78.91/3
    -0.267×68.64×3.3-0.133×42×3.3
    -0.267×68.7×3.3-0.133×42×3.3
    -0.267×68.64×3.3-0.089×42×3.6
    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

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