x^2-4x+4＞0
    log（10，x） > -80.59
    !(x)>1000
    -80+x-x*20%>50
    -80+x-x*20%>132.65
    （2x+1)/(x-3)>-1
    -1/2a>-1
    {32x+(28x-56)}/8≥12
    {32x+28(x-2)}/8≥12
    32x+28(x-2)/8≥12
    1+(1/3)m>=0
    [(500/25+900/30)y-500-900]/(500+900)≥25%
    (500/25+900/30)*y≥1.25(500+900)
    (500/25+900/30)*y≥(1+25%)(500+900)
    （S-7.5）/S ＞0.55
    1/x>1/4
    1/x<1/4
    ln(6-23.2x)-ln(6+23.2x)+7.7x>0
    3x-4≥x+5
    3x-x^4>2

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