(8-x^3)^(1/3)＞x(7^(1/3))+2-2x
    x²－4x＋4<0
    x²－4x－5<0
    ((-2x)^3+(3-2x)^3)^1/3>7^1/3x+3(1-x)
    （-x-1)^3+(2-x)^3>7
    x²+1>0
    x^2-2x-15<=0
    (x+1)/(x+1/8)<=10
    (x+1)/(x+1/8)<10
    1-2x+1＞0
    x/x+3<2
    2^x+x-3>0
    1/2^X≥4
    4k(1-k^2)>0
    60t-1.5t^2>216 t<=-60/(2*(-1.5))
    60t-1.5t^2>216 t<=-60/(2*(-1.5))
    60t-1.5t^2>216 t<=-60/(2*(-1.5))
    2-3m^2>=0
    （21+d）（21+4d）＜（21+11d）
    -3/2x²+30x＞0

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