e^x-x^2-x-1<0
    40*x-0.000000125*(2x+4600)^3≥20000
    40x-0.000000125*(2x+4600)^3≥20000
    40x-0.000000125*（2x+4600）^3≥10000
    40x-0.000000125*（2x+4600）^3≥20000
    (2x-1)/3>-x-5/2
    2x-1>0
    1500/x*6+(x-1500)/x*16%=13.09%
    y/0.26+(39-y)/0.76≤39
    0.26y+0.76(39-y)≤39
    1500x(1129－x/2)
    8h^2-50h≥30000
    x(x+3)<36
    abs2x－3≥5
    abs2x－1≤3
    （x－3）（x+2）≥0
    x^2－3x+4≥0
    2x^2－3x－2≥0
    －x^2+2x－3≥0
    x^2+x－2≥0

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