50(96-a)+80a<=5720
    v^2-89*v+1600≤0
    abs(x)<π
    x<√(xx)
    x>√(xx)
    2x<(x+1)
    x<(x+1)
    xcos(1)≥x
    x≥xx
    x>2x
    x/400-1.96(x*(1-x/400)/400/400)^(1/2)>0.2
    x/400>2
    x*x+2x-3 > 0
    ln(1000000000000000000000) 1000000000000000000000^0.1
    ln(10000000000000000000000) 10000000000000000000000^0.1
    ln(1000000000000) 1000000000000^0.1
    ln(10000000) 10000000^0.1
    ln(10000) 10000^0.1
    ln(10000)
    x*x-2x-3<=0

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