2ln0.9
    tan√6/2
    secarctan√6/2
    1×19.1×1300×74.30×(1120-74.30/2)+300×9236×(1120-80)
    1×19.1×1300×0×(1120-74.30/2)+300×9236×(1120-80)
    (300×15386-300×9236)/(1×19.1×1300)
    lg0.31
    lg3.22
    lg3
    ㏑5
    10×(1-8.22%-0)×12
    1042.43×［1-1/（1+8.0%）^56.70］
    119025/345
    (20-2*2)*2
    90%*(25*2+20*2)
    1-2
    ln20
    4000/3000-1
    arctan-0.54
    1042.43×［1-1/（1+8.0%）^33.94］

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