x*(1-(1-x)^256)^3>=0.995 0<=x<=1
    x*(1-(1-x)^256)^3>=0.995
    3*x*(1-(1-x)^256)^3>=0.995
    50-（100+X）×1%+X≥10
    50-（100+X）×1%+X≥10
    x+2<3x+3
    x+2
    x+2
    x+1>2
    x>2
    2lnx＞ln(2－x)
    -1/3≤1/x≤3
    x（x-1）>0
    x≥1/7
    x≥7/1
    x×½（20-x）≥42
    x+2>=0
    -1<=2-x<=1
    4+x>=0
    x-1>0

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