arcsin（5）
    -arctan0.05-arctan0.5
    (（112+36.384）)/4+(509.4)/(3.315×3.315×4)+0
    ［1748×（1+0.054）×1.0910×1+0］×0.9981
    ［1-1/（1+8.0%）^65.57］/［1-1/（1+8.0%）^70］=
    4188-2377+3415-2594=
    （1+0.0258）^3.42
    57.58/15.8
    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

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