5*(x^2)-4*x-2<=0
    30×3x+16×5（24-x）≥2100
    5*(x^2)-x-2<=0
    2*(x^2)-x-(8/9)<=3*(x^2)/4
    2*(x^2)-x-(1/2)<=3*(x^2)/4
    2*(x^2)-x-1/2<=3*(x^2)/4
    x^2-x-1/2<=3*(x^2)/4
    2^x-x-1/2<=3*(x^2)/4
    7x+300>=632.5
    35x+(100-x)*5<=2000
    180*(x-2)>2570
    180*(x-2)<2021
    180*(x-2)<2012
    x^3-2*x^2+x-5000000 > 0
    1/(((x+1)^(1/2))-1)<0.01
    1/(sqrt(x+1)-1)<0.01
    x-x^2<1/e
    (2X/10)+3sqrt(2X/10) < 1000
    x/10+3sqrt(x/10) < 1000
    2002×10^6≤18.4×1600×x(2950-x/2)

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