X-X*2%>500+450+690
    X-X*2%>500+450-690
    -4.29s×s+5s-0.1311＝0
    1.0948x+0.87(1-x)< 0.98
    1.0948x+0.84(1-x)< 0.98
    1.0948x+0.86(1-x)< 0.98
    1.0948x+0.85(1-x)< 0.98
    1.0948x+0.88(1-x)< 0.98
    1.0673x+0.8493(1-x)< 0.98
    x^(2)十x<=0
    1-(0.8^x)>0.9
    -x^2-4x+5>0
    (x-3)/(x-1)≤0
    8x-1≥16x^2
    (4x+1)^2≥0
    3x^2-19x+6≤0
    3x^0-19x+6≤0
    （x/2）-（2x-1/3)<1
    x/2-2x-1/3<1
    x/2-2x-1/3≤1

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