ln46
    ［725×（1+0.0713）×1×1+150］×0.9888
    ［1-1/（1+8.0%）^53.93］/［1-1/（1+8.0%）^70］
    8238323561+8160797.5962
    8242405980-4080399-2020
    2021*2019
    2020*2019
    4082420*2019
    4041.9998*2019
    2021*2020
    2020*2.00099
    (4042-2/2019）/2020
    4042-2/2019
    -0.001*0.04402^3+0.418*0.04402^2-8.341*0.04402+220.9
    -0.001*0.05264^3+0.148*0.05264^2-8.341*0.05264+220.9
    1+21.8%
    arctan（11÷3）
    arctan11÷3
    arctan200÷100
    arctan200÷100

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