(500+a)×90×(1.5-60)×0.8-(500+a)×(-15)×0.2≧15000
    abs(x-1)+abs(x-2)>4
    5x^x>2x+9
    2x-3<3x
    90000*2+(300√2-20x)^2<450^2
    5x^2-12x+2<0
    2a^2+a＜0
    2*0.95*x+4*0.95*(15-x)+4*0.6*x<4*15*0.95
    m^2-5<0
    A*0.4*9.8≥786.6+(2300-A)*0.145*9.8+ A*0.04*9.8
    （1/2)x^2-(1/3)x+1/5>=0
    x^2-2x>2x^2+2
    (2x^2-x+1)/(2x+1)>0
    (3x+1)/(2x-1)<2
    3x+1/(2x-1)<2
    3x+1/2x-1<2
    x+1/(x-1)>=0
    -x^2+x>=3x+1
    x^2-3x-18<=0
    2x^2+x<0

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