6／x－5≤1
    x/2＞11/4
    -4<(k−21)/7<-1
    （x-1）（x-2）大于0
    1.2×(3600/2x)+0.5×(3600/x)≦40
    1.2×(3600/2x)+0.5×(3600/x)≦400000
    -x^2-3*x+4>=0
    (1+(1+4x)^(1/2))/2x<1
    -12500+X-(50000+X)*1% ≥5000
    2x^2+5x+3>0
    1-(1-(10+k)/(50+k))^5>=0.85
    (x-6)(x+2)<0
    (6821.28+x)/(97925.62+X)>0.07
    -3*x^2+252*x-4860>0
    2x-4＞4（x+5）
    xxx<2
    -x∧2+x+6≥0
    (360-3m)/3<92
    ((360-3*n)/2)<46 n<92
    144+42x>0 156+52X<0

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