57.58/15.8
    -5.4878*17.91^2+196.57*17.91+1160.9
    (42+20-56）÷2
    (40+20-56）÷2
    (46+20-56）÷2
    (36+20-56）÷2
    0.8*480
    ln[(7.315-0.373*2)/7.315] =
    ln[(7.315-2.53)/7.315]= ln[(7.315-2.216)/7.315]= ln[(7.315-3.6773)/7.315]= ln[(7.315-2.753)/7.315]=
    7.315-2.53
    ln(7.315-2.53)/7.315= ln(7.315-2.216)/7.315= ln(7.315-3.6773)/7.315= ln(7.315-2.753)/7.315=
    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

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