{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
    (3x+2)/4≤(2x+3)/3
    a^2+0.262584a+0.0463626 ＜0
    1000-10n>2√n
    -2x+3＜5
    [30z+50(30-z)]*80%<1000
    30x+15*(24-x)<=540
    30x+15x*(24-x)<=540

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