0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0033*x+9.4
    0=-2.4*10^(-11)*x^3+4.81*10^(-7)*x^2-0.0036*x+9.6
    0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0036*x+9.6
    0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0034*x+9.6
    -(0.00001-x)(0.00001-x)(0.00001+x) = 2x*12.5*10^-12
    0=-2.4*10^(-11)*x^3+4.81*10^(-7)*x^2-0.0036*x+9.4
    0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0036*x+9.4
    0=-2.4*10^(-11)*x^3+4.8*10^(-7)*x^2-0.0034*x+9.4
    -(0.00001-x)(0.00001-x)(0.00001+x)=12.5*10^-17
    10xxxx-24xx=4320
    x*x+5*x+5=0
    2*x^4-14.4*x^3+33.8*x^2-28.2*x+4.5+1.99
    3.14^2*210*10^9/55.79^2*3.14*(0.052^2-0.044^2)
    x-1/3(x^3）=1/15
    3.14^2*210*10^9/55.79^2
    3x=09.0000000000000000009
    0.6x^2+1.2x=0.6701
    2400(1-1/3a)*100(1+5/2a)-1600*100(1+5/2a)=80000
    xx-0.5xxxx=0.05
    0.04x^2+1.2x=0.8221

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