125^0.8333333
    125^5/6
    125/494000-1.6/4
    5.53*（125^-0.167）*100000
    (15+2×19.2+4×19.2)×0.5-2×23.1×√0.5+10
    lg0.265
    lg0.18
    30÷25
    30/25
    lg(1.7×10^6)
    lg(1.7×10^3)
    lg1.7×10^3
    3.1565+（ 33.4853-0）×（9-0）/(200-0)×0.8
    1+4
    13+7
    77+22
    e^7
    e^4/0.49
    e^4/(e^(-1)+e^(-2))
    e^4/(e+1)

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