2/(F+3)<1/2
    10000*0.0175^n>10000
    800z>=1200(50-z)
    1500x+260(100+30-x)<=58600
    80x+50(50-x)<=3000
    a^2+1>a
    4+K^3-3K^2>0
    （30-x)+x+（25-x）
    (m+3)^2-4m-4>0
    （2m+1）^2-(4m^2-4)>=0
    （2m+1）^2-(4m^2-4)
    x>（100-x）÷3
    3x>100-x
    3x＋2≥6
     -2x^2+30X≥100
    -2x^2+30X=100
    (0.86/1.08^(1/3)+0.14)*11010.3/599.6
    （599.6V-1568.1）^3 = 9442.2^3*411/442.5
    （599.6V-11010.3*0.14）^3 =9442.2^3*411/442.5
    （599.6V-1568.1）^3 = 411/442.5

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