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）
    X>1-x/2
    2m+3>0
    2(x-1)<3(x+1)-2
    2(x-1)<3(x+1)=2
    (3x-1)/5≥(1-5x)/6
    (3x-1)/5≥(1-5x)6
    10x+20(50-x)>750

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