f
    （0.021*x^1.85+840）^0.5*x^0.84=1.645
    （0.021*x^1.85+1783）^0.5*x^0.84=1.645
    （0.021*x^1.85+794968）^0.5*x^0.84=1.645
    392×x^2+784x-181 = 0
    2×x^2-51x+315 = 0
    x*e^x=1
    x*e^x=1
    x-x^2=0.04
    x^4+40x^3+400x^2-2000x-20000=0
    x^4+40x^3+400^2-2000x-20000=0
    2x^3+90x^2+1200x+3000=0
    x^3+6x^2+9x=0
    e＾x＾2sinx
    X^2+50x-10000
    lnx＝ln（4×10^-3）-（3×10^（-19））÷（1.38×10^（-23）×1023）
    1+8^x=9^x+x^15
    sinx+8^x=9^x+x^15
    sinx+8^x=99^x
    sinx+8^x=9^x

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