3x^2+x-1＜0
     1.0187 ^ X * 0.9887 ^ ( 1 - X ) >1
     1.0987 ^ X * 0.9887 ^ ( 1 - X ) >1
    200x+（8-x）160≥1380
    12x+（8-x）10≤89
     1.0287 ^ X * 0.9887 ^ ( 1 - X ) >1
    1 <= n^2/2 - 36*n + 73/2 <= n
    x^2/2 - 36*x + 73/2 >= 1 x^2/2 - 36*x + 73/2 <= x
    1<=x^2/2 + 36*x + 73/2
    1.9987 ^ X * 0.4987 ^ ( 1 - X ) >1
    1－2x/1+x>3
    4 ^ X * 0.25 ^ ( 1 - X ) >1
    2 ^ X * 0.5 ^ ( 1 - X ) >1
     1.0087 ^ X * 0.9887 ^ ( 1 - X ) >1
     1.0987 ^ X * 0.8987 ^ ( 1 - X ) >1
    4.6X^3+5.915X^2-52.79X-82.938>=0
    4500+168x>12500+58x
    2000+114x>6000+29x
    6000+25%（x－1）<4800x
    x＾2-6-x<0

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