3x-1<3+x
    (x+4)/3<3-(3*x-1)/6
    (3*x-1)/5-(x-1)/2>=0
    -2089.863+769.2792n+n^2/3×(682.613+19.119n)×(2047.839+38.238n)/(1365.226+38.238n)-0.4×n^2×(231.616+4.766n)×(694.848+9.531n)/(463.232+9.531n)≥0
    3x-2（5-x）小于等于4（7x-1）+1
    ( 2 * ( 2.78 + x ) + 0.8 * 9 ) * ( 79.79 + 7.8 * x ) / ( 12.78 + x ) / 90 >1.5
    ( 2 * ( 1.6+ x ) + 0.8 * 9 ) * ( 72.69 + 7.8 * x ) / ( 11.6 + x ) / 90 >1.5
     ( 2 * (1.3+x) + 0.8 * 9 ) * ( 70.87+ 7.8 * x ) / ( 11.3 + x ) / 90 >1.5
    (2^k)-1>=16+k
    (2^k)-1>=4+k
    (2^k)-1>=9+k
    2^k-1>=9+k
    2^k-1>=16+k
    2^k-k>=17
    （2*x+0.8*9)*(63.6+7.8*x)/(10+x)/90>1.5
    4x-5≥3（x-2）
    113/2-7m≥355/6
    -3x≥6
    [4(1-k)]^2-4×3(k^2+4k-5)＜0
    4K(4K-5) <0

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