＜8/（20×r2/20+r2）＞-8/r2＝0.4
    4x-1/x+1＞3
    50≤X≤86
    2x+1＜x+11
    x*(36-3*x)>=105
    36-3*x>20
    36-3*x>2
     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

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