x-(x+2)/2<(2-x)/3
    7x-1≤3+9x
    1.081x+0.87(1-x)< 0.98
    1.081x+0.88(1-x)< 0.98
    （2x+1）/5<(x+1)/2
    3x-2≤x
    -450+x-690-e*8%/2>500
    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

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