1/（1*2）+1/（2*3）+1/（3*4）+1/（4*5）+1/（5*6）+1/（6*7）+1/（7*8）+1/（8*9）+1/（9*10）
    60∧2
    2.4/0.95
    ((2746×9.55)/(50×17.5×0.2))
    ((2746×9.55)/(50×17.5×0.2))
    ((1.6×9.55)/(50×29×0.2))
    ((1.6×9.55)/(0.8×29×0.2))
    ((1.6×9.55×10^6)/(0.8×29×0.2))
    ((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

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