210-120n+6*600*(7-2n)*(n-1)>500
    210-120n+6*300*(7-2n)*(n-1)>500
    210-120n+6*200*(7-2n)*(n-1)>500
    210-120n+6*100*(7-2n)*(n-1)>500
    210-120n+6*20*(7-2n)*(n-1)>500
    210-120n+6*8*(7-2n)*(n-1)>500
    210-120n+6*6*(7-2n)*(n-1)>500
    210-120n+6*3*(7-2n)*(n-1)>500
    210-120n+6*(7-2n)*(n-1)>500
    210+120*x+6*（2x+7）*（x-1）>500
    1-x^3-5x^2>500
    x<2^3
    -abs(x)
    ex
    lnx/x^6>0
    -23.5cos（0.4t）+25>30
    lg（3x-1）-1>0
    abs(x-2)>abs(x+4)+7
    abs(x+3)>abs(x-5)+7
    -1/(x^2)

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