4x－2(25－x)≥60
    -1532750+A-A×0.025≥300000
    x^2≤0
    2/(x-1)≥0
    3(1-x)<2(x+9) (x-3)/5-(x+4)/2<=-7/5
    (-2)^2-4(m-2)≥0
    (3x-1)/2-(5-2x)/3<=(5x+3)/4-2
    (8a+300-6a)*0.8+8.5*18≤400
    0.54*x-((1-x)*(1-0.54) > 0
    7x<6x-3
    -3(x-2)<=4-x
    （4a+1）/10≤3/5
    2（2a-1）+1>2a
    x×x-0.228x+0.002189≤0
     x×x-0.428x+0.003224≤0
     (3/x+1) <= (6/3x-2)+1
     (x+1/3)<=(3x-2/6)+1
    (8*t+110)*(2*t+8.4+8.64)≥1.6*108*(t+17)
    (8.5*t+158)*(2*t+10.4+8.64)≥1.6*108*(t+18)
    (8.5*t+158.5)*(2*t+10.4+8.64)≥1.6*108*(t+18)

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