3a>a^2+a-2
    -17x+8x-144>0
    3a-3>a^2+2a
    1-(1-1/x)/lnx<0.001
    -3＜
    20(100-x)≦400/x+30
    x2-5x+4>=0
    (1+16*(x+80)/(x+80+2000)+0.8)*0.9>=(1+16*x/(x+2000)+0.15)*1.1
    1+16*(x+80)/(x+80+2000)+0.8>=(1+16*(x+80+150)/(x+80+150+2000))
    1+16*(x+80)/(x+80+2000)+0.8>=1+16*(x+80+100)/(x+80+100+2000)
    1+16*x/(x+2000)+0.8+4>=(1+16*x/(x+2000)+0.15+4)*1.1
    1+16*x/(x+2000)+0.8+4>=(1+16*x/(x+2000)+0.15+4)*(1+(0.3-0.1)/2)
    1+16*x/(x+2000)+0.8>=1+16*x/(x+2000)+0.15
    16*x/(x+2000)+0.8+1>=(1+16*(x+80)/(x+80+2000))
    1+16*x/(x+2000)+0.8>=(1+16*(x+80)/(x+80+2000))
    1+16*x/(x+2000)+0.8>=(1+16*(x+50)/(x+50+2000))
    1+16*x/(x+2000)+0.8>=(1+16*(x+150)/(x+150+2000))
    (1+16*x/(x+2000)+0.15)*1.1>=1+16*x/(x+2000)+0.8
    (1+16*(x+100)/(x+100+2000))>=1+16*x/(x+2000)+0.8
    (1+16*(x+150)/(x+150+2000))>=1+16*x/(x+2000)+0.8

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