4000x-8000+1000x<30000
    4000x+1000x+2000<30000
    x^2+3*x>16
    4x^2-12x+9≤0
    4x^2-12x+9<=0
    4x^2-12x+9<0
    5x^2-4x+1<0
    x^2+3x+3>0
    3x^2-2x-2>0
    x^2-2x+2<0
    x^2-3x-2<0
    2x^2+2x-1>0
    x^2+5x+6>0
    x^2+5x-6>0
    2x^2+x-6>0
    x^2-4x+3<0
    2x^2-5x+2>0
    x^2-x-2<0
    sinx*sin7x<1/4
    3（x7/3）

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