8x^2-21x+104>0
    8x^2-21x+104＜0
    310x+50(460-x)<18000
    964.18+587.31x+(242.88x+17.5x^2)×(242.88x+11.66x^2)/(485.76+34.99x)-(241.32x+7.74x^2)×(201.1x+4.30x^2)/(402.2+12.89x)≥0
    （x-1）（x-2）＜0
    x+3>=3(x-2)
    x+4>=3(x-2)
    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

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