-2<1-A<2
    30x-330>980
    30(x+1.5-11.9)/165.2*30(x+1.5-11)/980>1
    30(x/1.5-11.9)/165.2*30(x/1.5-11)/980>1
    x*abs(x-2)<3
    xabs(x-2)<3
    x^3-7*x-6<0
    2x^2+2x-4≤1/2
    (15+x)(180000-2000x)>2700000
    (15+x)(18-2000x)>2700000
    [60（1+0.5x）-40(1+x)]1000(1+0.8x)>2000
    350-10*t+35*t-t*t≥500
    (3x-35.7)*(3x-33)/1618.96>1
    x+3>5
    abs（x-2）/（5-x）≤1
    4(a+1)^2-4a^2≧0
    3x＾2－20x＋12＞0
    500*1.5<=(500-x)(1+0.005x)
    1-a/a^2>0
    a-1/a^2>0

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