tan（arccos0.74）-tan(arccos0.92)
    129.30+85.00+39.50+9.19+25.38+34.60
    129.30+85.00+39.50+9.19+25.38+34.60
    （129.30+85.00+39.50+9.19+25.38）×12%
    （129.30+39.50+85.00）×10%
    （129.30+39.50）×1×4.35%+85.00×1×0.5×4.35%
    tan(arccos0.86)-tan(arccos0.92)
    tan(arccos0.74)-tan(arccos0.92)
    tan（arccos0.73）-tan（arccos0.92）
    tan（arccos0.899）-tan（arccos0.92）=
    tan（arccos0.73）-tan（arccos0.92）
    -arctan(0.25)-arctan(1)
    -arctan(40)-arctan(160)
    1800/761*4500/1.6
    0.02 × 20 × [0.3 + (0.9 − 0.12) × 2]
    25 × 0.3 × (0.9 − 0.12)
    209.282×0.12
    59.63×0.12
    262.12×0.12
    2.092×7.2×2

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