x*(36-3*x)>105
    (91.25*(n-1)/(3*n+1))*(91.25*(n-1)/(3*n+1))+(1825/(3n+1)+97.33)*(1825/(3n+1)+97.33)＜＝60.75*60.75
    (91.25*(n-1)/(3*n+1))*(91.25*(n-1)/(3*n+1))(1825/(3n+1)+97.33)*(1825/(3n+1)+97.33)＜＝60.75*60.75
    (91.25*(n-1)/3*n+1)*(91.25*(n-1)/3*n+1)+(1825/(3n+1)+97.33)*(1825/(3n+1)+97.33)＜＝60.75*60.75
    2（2x-5）≤3（4x+2）
    （x-2）÷4 < 0
    a^2-a^3<1
    a^2-a<1
    a^2+a<1
    a^3+a^2<1
    （-3a+1)/2≥1
    (0.5x+1)-（2.25x/（2.5-0.25x））>0
    x^4-x^2>12
    x*4-x*2>12
    -3x^2-4x+4>sqrt(5)
    25×0.13<(3-1/3x)×0.75
    4x-x^2+3>=0
    x*x<3
    x^2+2x+1>0
    （2x-1）(x+1)>0

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