x+2>=3(x-2)
    1+2x>3x+3
    0.5x+2≥6/x
    -1≤（3y-1）/（1+y^2）^0.5≤1
    2*k*(0.8)^(k-1)>=9
    2k*(0.8)^(k-1)>=9
    (0.8)^(k-1)>=(9/2*k)
    (0.8)^(k-1)>=(9/2)*k
    111.23*(0.59+n)+6121n^2+1987.37n^3+121n^4 +97.98*(10.4+n)+428.37*(6.4+n)1.25*(376.77*(2.32+n)+(174.05n+7.07n^2)*(522.15n+7.07n^2)/(1044.3+21.2n))>=0
    2n>=3
    6791.86+1238.8n+(155.03n+22.01n^2)/(240.54+66.03n)*(45.59n+11n^2)-1.25*(747.78*(3.86+n)+(267.21n+6.24n^2)*(911.91n+12.49n^2)/(1603.23+37.47n))≥0
    4x^3-2x^2-2＞0
    ((1-n/50000)/n)*206 <= (9.5*0.1/1.96)^2
    (1-n/50000)/n*206<=(9.5*0.1/1.96)^2
    1.96*sqrt((1-n/50000)/n*206)<=9.5*0.1
    1.96*sqrt((1-n/50000)/n*206)<=0.1*9.5
    6830.42+544.59n+((155.03n+22.01n^2)/(240.54+66.03n))*(69.83n+11n^2)-1.25*（747.78*（3.86+n)+(267.21n+6.23n^2)*(911.91n+12.49n^2)/(1603.23+37.47n))≥0
    6830.42+544.59n+((155.03n+22.01n^2)/(240.54+66.03n))*(45.59n+11n^2)-1.25*（747.78*（3.86+n)+(267.21n+6.23n^2)*(911.91n+12.49n^2)/(1603.23+37.47n))≥0
    6830.42+544.59n+((177.05n+22.01n^2)/(273.57+66.03n))*(45.59n+11n^2)-1.25*（747.78*（3.86+n)+(267.21n+6.23n^2)*(911.91n+12.49n^2)/(1603.23+37.47n))≥0
    6711.26+479.5n+((223.62n+22.01n^2)/(347.97+66.03n))*(58n+11n^2)-1.25*（747.78*（3.86+n)+(267.21n+6.23n^2)*(911.91n+12.49n^2)/(1603.23+37.47n))≥0

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