9+99+999+9999+99999；57*36+64*32+64*25；9-1+99-22+999-333+9999-4444+99999-55555+100000-1
    240:12
    16*15
    268/6/1
    log(2,10)
    sqrt(20)
    log(2,20)
    log(2,100)
    50*(1+5.2%)^8
    1.052^8*50
    2420.717+14.02×4.7×1.7=
    11.894+13.43×4.7×1.7×0.1+1.184×0.6
    -50.509-14.02×4.7×1.25×0.1+22.806×0.6=
    2101.222+14.02×4.7×1.25=
    -50.509-13.74×4.5×1.25×0.1+22.806×0.6=
    1870.783+20×2.8×3.7×0.5×(1.7+1.25)=
    200+1.6×18×(1.7-0.5)=
    1635.045+20×2.7×3.5×0.5×(1.7+1.25 )
    1635.045+20×2.7×3.5×0.5×(1.1+1.25)
    1635.045+20×2.7×3.5×0.5×1.1×1.25

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