cosx＞1/2
    -30*x+872*x-760.5>720
    202<=12x+10(20-x)<=206
    (2x+1)/3-(1-x)2<1
    5x-2>=3x-4
    10x-5(20-x)>100
    (3x-7)>=4x-23
    x^2+200*x+1>0
    x^2+200*x-1<0
    x^2+200*x<1
    4*x^2-x-60≥0
    e^(1-a+3)-4a>= 0
    e^(e+3-a)+3e-10-4a <= 0
    e^(e+3-a)+3e-10-4a<=0
    x-1>4x-8
    3x-3<5x+1
    2861-0.00000189*（x-100000）<=0
    4a＾2＋18a－53＞0
    a^2－6a≥－5
    4x^2/(x^2+1)^2-2x/(x^2+1)^2-2/(x^2+1) >0

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