x²/（100-x）(500-x)=1.43
    2/3*x*x*x
    2023(5-y)+14155=2028-y
    x/((0.05-x)*(0.25-2*x)^2)=1.1*10^7
    x/((0.05-x)*(0.25-2*x)^2)=1.6*10^7
    12138+m=-2017
    x/((0.05-x)*(0.25-2*x)^2)=0
    2.5*sqrt(5.29)/(x*sqrt(1+x^2)*sqrt(1+(0.25x)^2)) = 1
    2.5*sqrt(3.69)/(x*sqrt(1+x^2)*sqrt(1+(0.25x)^2))=1
    2.5*sqrt(2.77)/(x*sqrt(1+x^2)*sqrt(1+(0.25x)^2))=1
    4x^3-5x+2=0
    x^6+17x^4+16x^2-100=0
    1+x=6
    2%=42.21%*x+（1-x）*（-29.68%）
    2%=42.21*x+（1-x）*（-29.68%）
    2%=42.21*x+（1-x）*（-29.62%）
    0.2/0.3x-0.1-3/2x+9=-6
    25.24:7.02=X:2
    x^2=18.8^2+（28-x）^2/4
    5*x^5-23*x^4-176*x^3+320*x^2-1024*x-1024

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