3246023*(4174-451.431)/(1256*451.431)
    [0.87-0.12(1-0)(520/4174)(520/4174)]*520
    (88.12×10^3)/(0.282×2195×215)
    599*0.7*0.9
    165*6
    165*4
    2^7=
    （170－8）÷（5+4）×5
    2885.55/18.287
    2885.55/62.819
    2000/62.819
    2000/18.287
    3606×√(1/2(1+24.42/88.12))
    -509000+138240/1.1+138240/1.1^2+138240/1.1^3+138240/1.1^4+213440/1.1^5
    (88.12×10^3)/2195
    (35.44×10^3)/2195
    lg0.02355
    50000*1.02^120
    【4-（3/4-5/8）】*4/29
    0.0598×1.56-0.0263

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