99(1-x)[(1-0.02)^27] >0.015
    299(1-x)[(1-0.02)^192] >0.015
    279(1-x)[(1-0.02)^180] >0.015
    249(1-x)(1-0.02)^164 >0.015
    249(1-x)[(1-0.02)^164]>0.015
    10000<(1000-x)（1+0.2x%)10
    (x-1)/(x-3)>0
    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

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