(13% / 13%) * (7% - 2%) - (7% - 2%)
    (7% - 2%) / 1
    (7% - 2%) / 13%
    2% + 1 * (7% - 2%)
    12.5% - [2%+0.7 * (7%-2%)]
    (13% / 16%) * (12.5% - 2%) - (7% - 2%)
    (12.5% - 2%) / 0.7
    (12.5% - 2%) / 16%
    (3.8% - 2%)/3%
    (10.8% - 2%) / 18%
    2%+0.7 * (17% - 2%)
    10.8% - [2% +1.1*(7% - 2%)]
    (13% / 18%) * (10.8% - 2%) - (7% - 2%)
    (10.8% - 2%)/1.1
    (10.8% - 2%)/1.1%
    2%+1.1*(10%-2%)
    ln（0.000001）
    ln100000
    asin(8)-sin(8)
     19-12 68-25 88-70 34+16 69+5 66-25 29+17 42-9 53-6 24+18

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