1=-2.4*10^(-11)*x^3+2*10^(-7)*x^2-4*10^(-4)*x+4
    65×20+40X≤2000
    2.74*10^(-4)=-2.4*10^(-11)*x^3+2*10^(-7)*x^2-4*10^(-4)*x+4
    1+1/2x>(1+x)^1/2
    2.74*10^(-4)=-2.4*10^(-11)*x^3+2*10^(-7)*x^2-5.99944*10^(-3)*x+4
    （10+x）（500-20x）=6000
    2.74*10^(-4)=-2.4*10^(-11)*x^3+9.2*10^(-7)*x^2-0.0042*x+4
    3x^4+x^3-24x^2=3x^2+9x
    2.74*10^(-4)=-2.4*10^(-11)*x^3-9.2*10^(-7)*x^2-0.0042*x+4
    a^2-3a=1
    (3/x-1)-(2/x)=0
    0.4298x^2+2184.88x-9629222.4=0
    2.74*10^(-4)=-2.4*10^(-11)*x^3-1.79944*10^(-3)*x^2-0.0042*x+4
    0.04298x^2+218.488x-9629222.4=0
    0.0007298x^2+2.18488x-9629222.4=0
    2.74*10^(-4)=-2.4*10^(-11)*(x+5000)^3+5.6*10^(-7)*(x+5000)^2-0.0042*(x+5000)+14
    -17258.8*(1-y)*0.8929+(24405.34-2594.29-26741.20*(1-y)*0.7972+(20818.76-2213.03)*0.7118+(12256.87-1302.91)*0.6355=0
    40p^2+35p-75=0
    x（26-2x）=80
    -10858.8*0.8929+(24405.34*(1-x)-29335.49)*0.7972+(20818.76*(1-x)-2213.03)*0.7118+(12256.87*(1-x)-1302.91)*0.6355=0

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