Mathematics
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    x1+x6≥60 x1+x2≥70 x2+x3≥60 x3+x4≥50 x4+x5≥20 x5+x6≥30
    x1+x6≥60 x1+x2≥70
    a^2-3<0
    (8+x)/(17+x)>0.56
    x
    
(4+x)/(11+x)>0.55
    lnx>log(2.718,x)
    lnx>absx
    lnx>lnlnx
    x
    
x^2<0.01
    x^2<0.0001
    x^2<0.000000000001
    x^2<0
    2x^2+4x+6
    
25*1.2^x-25>0.5x^2+9.5x
    -3x<-6
    4+4*3a大于0
    3/2x-1>x-1
    90z-10(16-5z)<=1100

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