3/a^2-1/2√3-4a^2=1
    (1-x)/2>(2x-1)/3
    245.2/(93.72x+6.28)+525/(98.164x+1.836)+42/(93.72x+6.28)+55.64/(76x+24)=20
    (20-x)(-10-x)(5-x)-(5-x)(26)(26)=0
    0.07x=11.2
    245.2/(93.72x+6.28)=20
    0=-2.4*10^(-11)*x^3+4.93*10^(-7)*x^2-0.00335*x+9.1
    518647500x*x*x*X-8264025x*x+5.3361=0
    ln3
    245.2/(93.72x+6.28)=0.02
    0 =-470+164/(1+x)+245/(1+x)^2+342/(1+x)^3+431/(1+x)^4+495/(1+x)^5
    5x+28000-8x=23500
    5x-2(18-x)>=60
    5x-2(18-x)=60
    7.7+(15*7.7)=7.7+0.4X
    x+x^3=0
    5x+（3500-8）×8=23500
    7.7+(15X*0.4)=8.1*X
    24：x=8：3
    -x>-5

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