3*x*x*x*x+3x*x+4x<6
    3*x*x*x+3x*x+4x<6
    3x*x+4x<6
    3x>4
    7x+2>14x-6√x
    √x-8x-33<0
    1≤（x+5）÷2≤2
    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)

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