（160.6*7.98-69*13.04）/11.93=
    235-155-6-5=
    （160.6*7.98-5*11.96-88.7*12.93）/13.04=
    234.7-141-5=
    11.96*86/7.98=
    236-5-5-39.5-100.5=
    236-5-8-39.5-100.5=
    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

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