600-(800*ln7-1000)
    (1+3%)^20-1
     (1+3%)^4-1
    (1+1%)^12-1
    log(e)
    0.005924*12
    (1+x/12)^12=1.00594018
    10*e^(x^2-2)=377987
    3000*0.1025
    2^x=3.625%*2^43
    （x-80）0.7=（3+x-70）0.6
    2795*(1+5.12%/12)^9+1729*(1+5.12%/12)^2+5647*(1+5.12%/12)^-12
    x/5＝(x－2000)/4
    6(x-3)=84
    2^3*8
    (0.021*0.057^1.85+0.25*2025/3.14)^0.05*0.057^0.84
    (0.021*0.057^1.85+0.25*2025/3.14)^0.05*0.057^0.84
    log(10)
    2^(2*82.5+17)
    2^(2*82+17)

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