(134770000/（X-18） -1 )*（50-(79-2X)） ＜306540000
    134770000/（X-18）（2X-29）+29-2X＜306540000 X＞18
    134770000/(X-18)(2X-9)+9-2X＜306540000
    x^(-0.405)+100<0.5*x
    1/i-1/i(1+i)^7＜4.167
    X^2-2X-8＞0
    x*x-x<-1/14400
    x*x-x<-1/6400
    x*x-x<-1/3600
    x*x-x<-1/1600
    x*x-x<-1/1296
    x*x-x<-1/1024
    x*x-x<-1/400
    (1+x+0.65)*1.21^2*1.12^2*1.057>(1+x)*1.21^3*1.12^3
    (2x+1)/3>=(1-x)/2 1-x/2>x/3-x
    4x-3<3(2x+1) 3x/2-1>5-1/2x
    5>3(x-4)+2 2x-3>=1
    x-8>2(x+2)
    x/2+4<=x-1
    1-0.8^(n)-0.2*n*0.8^(n-1)>=0.9

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