50x+35(600-x)>=26400
    ((x^2)-4x+1)/((3x^2)-7x+2)≤1
    sinx≥0
    (2x-6)(x+5)(x+5)＜0
    x2e-5x+4<0
    -X^2+4≥0
    23x^3-330x^2+1200x+1100+1800x <1.9260*5000
    23x^3-330x^2+1200x+1100+1800x <1.5280*5000
    23x^3-330x^2+1200x+1100+1800x <1.1690*5000
    23x^3-330x^2+1200x+1100+1800x <0.3540*5000
    23x^3-330x^2+1200x+1100+1800x <1.9260*10000
    23x^3-330x^2+1200x+1100+1800x <1.5280*10000
    23x^3-330x^2+1200x+1100+1800x <1.1690*10000
    23x^3-330x^2+1200x+1100+1800x <0.3540*10000
    23x^3-330x^2+1200x+1100+1800x <0.3540*2000
    23x^3-330x^2+1200x+1100+1.8x <0.3540*2000
    23x^3-330x^2+1200x+1100+1.8x <0.3540*1000
    23x^3-330x^2+1200x+1100+1.8x <1.9260*1000
    23x^3-330x^2+1200x+1100+1.8x <1.9260*10000
    23x^3-330x^2+1200x+1100+1.8x <1.5280*10000

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