x/30-1/90≤36
    （x-18）（-2x+100）≤540
    7
    7
    2x＋1＞4
    -3X+2>2X-1
    (6821.28+X)/(102077.62+X)≥0.07
    (500-2*x)- (300-x) >= (300-x)
    (500-2x)-(300-x) >= 300-x
    2X2一4X<0
    (6821.28+X)/(97925.62+X)≥0.07
    4*x*x-4*x+3>0
    x－5／6≤1
    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

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