((1.6×9.55×10^6)/(50×29×0.2))
    ((1601.83×9.55×10^6)/(50×29×0.2))
    ((2746.00×9.55×10^6)/(50×17.5×0.2))
    12.5+7.5-12.5+7.5
    (2×π×17.5)/60
    tan arccos0.65-tanarccos0.92
    tan arccos0.65-tan arccos0.9
    （8/27）+1/12
    （8/27）+1/12
    635-1.96*127/√120
    √13568.64
    √13568.64
    √13568.64
    1614667.79/119
    （426.57-250）²*19+（426.57-350）²*30+（426.57-450）²*42+（426.57-550）²*18+（426.57-650）²*11=
    （1/2022）²+（6*1/2022）+6
    3*（1/2022）²+6*1/2022
    【3*（1/2022）²+6*1/2022】/（1/2022）²+6*1/2022+6
    !(10)
    sin270+cos160

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