1-3c>0
    3x^2-2x>0
    1-3x>0
    (1-3x)^2-4(3x^2-2x)>0
    10(1+x)x/2>=2000
    (1-x)/2>x-2 2(x-3)<=x-8
    2a+1>a-2 a-2>0
    -1<=(y+4)/2<2
    0.5m-0.2>0 0.4-0.5m>0
    2x-6>0 4-x<-1
    2x-6>0
    X/2-8小于x- 2
    x^3-3x+1≥1
    (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

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