0.505x+0.872＞1
    0.472x+0.527＞1
    0.284x+0.562＞1
    0.265x+0.664＞1
    a^2+5a+5>0
    a^3+5a^2+5a>0
    a^3+5a^2+5a>0
    16≥6x
    6-3/2t<3
    6-3/25<3
    6-3/25<3>
    5/3z+5小于等于31
    (2x-1)/3-(5x+1)/2>=1
    1/15*x+2/3<=3/5
    2x-1<=(x+7)/3
    ((10^(-6))+(10^(-21))*(x^2))*((2501*x+(10^8))>=(5*(10^(-6))*x+500)/(0.18)
    ((10^(-6))+(10^(-21))*(x^2))*((2501*x+(10^8))>=(5*(10^(-6))*x+500)/(-0.15)
    ((10^(-6))+(10^(-21))*(x^2))*((2501*x+(10^8))>=(5*(10^(-6))*x+500)/(11/20)
    x^2>=3*x+18
    x^2>=3*x-4

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