150.6*7.98/11.96=
    （140.6*7.98-53*12.14）/12.14=
    236-5-5-100.5=
    150.6*7.98/11.96=
    （140.6*7.98-56*12.14）/11.96=
    236.3-175-5=
    lne/e+ln3/e
    ln0.11
    ln0.90
    ln0.05
    ln0.95
    ln0.31
    ln.31
    ln.73
    ln0.28
    ln0.75
    ln0.8
    ln0.2
    -ln23
    -ln1.2

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