100a+30(10-a)>=485 20a+50(10-a)>=335
    -2x≤0
    80x+50(50-x)<=3000
    x^2-5x-6<0
    x^2-x<6
    5x-4x^2-2>0
    x(2x-3)<0
    x-745.23x^(-1/8)+25.72x^0.4167>=0
    x-745.23x^(-1/8)-25.72x^0.4167>=0
    2-3x>=-1 x-1>=-2(x+2)
    2-3x>=-1 x-1>=-2(x-2)
    2x+9>3(x+4)
    1/（x－2）≥1
    0.3m+0.8*(100-m)<=50
    5x≥2
    1/2x-1>7-3/2x
    5x-2>3*(x+1)
    3x<3
    2.5 * x ≥10000
    2.5x≥9000

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