0.038416x^3-100x^2+40000x-4000000≥0
    x－1>=(x－2)^(2)－1
    x+1>0
    x-1>0
    -2x^3-3x^2 >1
    17/4*x-17>5*x-17*5/4
    1+x>0
    1-x>0
    sqrt(2+2t)>-t/10
    sqrt(2+2t)<0
    sqrt(2+2t)>-10/t
    5x/6+2<－（x+5/4）
    (3x+1)/2-(2x-1)/3<－1
    (5x)/6+2<-（x+5）/4
    5x/6+2<-（x+5）/4
    （x+3）/2<（2x-5）/3+3
    2x+3（x-2）≥4
    5x≤4x-1
    1+2x>3+x
    2x-（1+3x）/2<1

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