10000<(1000-x)（1+0.002x)10
    x^2-16>0
    10000<(1000-x)（1+0.002x)
    249*x*[(1-x)^164] >0.015
    249*x*[(1-x)^164] >249*(1-x)
    249*(1-x)*[(1-x)^(163*x)] >0.015
    249*x*[x*(1-x)^163] >0.015
    249*x*x*[(1-x)^163] >0.015
    249*x*[(1-x)^(163*x)] >0.015
    249x*(1-x)^163x>0.015
    -1+(x-7)/(x^2+3)<1/x
    -1+(x-7)/(x2+3)< 1/x
    N*0.98^164>0.015
    x^2+2x>=0
    X+1/X>0
    1/X>-1
    -1<=x+0.5<=1 -1<=2x-0.5<=1 x+0.5>2x-0.5
    1+1/x>0
    249*（1-x）^163x>0.015
    (x-1)^2<=0

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