2（x^3）>（x^3）/1000-100x^2+10
    （x^3）/100000<（x^3）/1000-100x^2+10
    （x^2.5）/10000<（x^3）/1000-100x^2+10
    （x^8）/10000<（x^3）/1000-100x^2+10
    0<-100x^2+10
    （x^3）/10000<（x^3）/1000-100x^2+10
    x^4/10000
    x^4/2
    x/2
    x^2/2
    x^3/1000
    x^3/10000
    x^2+2x+1<0
    -1/3≤1/x
    -1/3≤1/3
    1/x≤3
    x^2-89x+1600<0
    2^n>=n^6
    -1≤x+sqrt(1-x)≤1
    -1≤x-sqrt(1-x)≤1

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