5x-3≥7
    0.35y+50/1800-100y×0.25≤8
    0.35y+1800-100y/50×0.25≤8
    （x-4）÷（X+4）≥97%
    3x 12x≤7x+2
    x×x+x＜0
    (3000-6*(100+a))/sqrt((100+a)*16)＞2
    0.3n+0.8(100-n)<=50
    7x-1/5-3≤2x-5
    5/7x-1-3≤2x-5
    x^2-4x<0
    x^2-x-6<=0
    x^-x-6<=0
    x^2-x+6<=0
    (x-1)(x+3)<=0
    abs(3x-4)<2
    abs(x+5)>3
    abs(1-2x)<3
    (14417.44+X)/(97925.62+X+37)≥0.15
    (6821.28+X)/(102077.62+X)≥0.15

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