sin1000
    (17×(2.1-1)+18.5×3+18.6×2.5+19.1×(10.5-2.1-3-2.5))/(10.5-1)
    log(9)
    lg(18426.007/14912.509)/15
    lg(258.687/191.6)/15
    lg(15410/6424)/15
    lg(15410/6424)
    (1/15)*log(15410.0/6424.1)
    （1/15）*log(18426.007/14912.509)
     (-2)^2020-3*(-2)^2019
    1.131772267967863e+57
     (-2)^2020-(-2)^2019
     (-2)^2020-3(-2)^2019
     ((-2)^2020)-(3(-2)^2019)=
     （(-2)^2020）-3*(-2)^2019
    （-2）^2020-3*（-2）^2019
    3.807488253739571e+85
    6+1
    13.8*2/300*10000*0.037
    13.8*2/300*10000*0.09

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