27/（1-50%）=
    (69+90.5*0.9*0.9+8)/(1-15%)=
    50.8+25.96
    （10013.15-8014.27）/77
    50.8×77+81.9×74.5
    50.8×77+57.22×71.7
    （69+90.5*0.9*0.9+8）/（1-18%）=
    65/（1-1.5%-50%）=
    49.8132 × 1.1423
    0.996264×50
    1/1.00375
    1+0.00375
    0.75%/2
    -0.00450485/0.90277151
    ((0.0091324 - 0.0091424) ÷ 0.0091424) × (360 ÷ 90) × 100%
    1/3×52.2×3.3-2/3×84.4
    1/3×52.2×3.3-1/3×84.4
    1/3(52.2+42)×3.3-84.4
    -0.267×52.2×3.3-0.133×42×3.3
    1/3（52.2+42）3.3-84.4+1/3（-121.2+84.4）

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