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
    x-(x+2)/2<(2-x)/3
    7x-1≤3+9x
    1.081x+0.87(1-x)< 0.98
    1.081x+0.88(1-x)< 0.98
    （2x+1）/5<(x+1)/2
    3x-2≤x
    -450+x-690-e*8%/2>500

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