(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
    （150-100）100+（x-90）200≥11000
    12/x-4<0
    1.571*(200*x-1630)+0.38465*(400+6*(28.73+10*x)*(x-6.1)/(x+5))>3392.7272+3.927*x
    12x+(10-x)*10<107
    2x-7<5 (x+4)/3>2.5
    2×5^x<=8^x-7^x
    1.57075*(590+200(x-11.1))+0.3848*(400+6*(15+51.52+41.76+31.45+10*(x-11.1))*(x-6.5)/(x+5))>3533.31+58.9+0.785375*(15.08+30.24+24.05+10*(x-11.1))
    1.57075*(590+200(x-11.1))+0.3848*(400+(15+51.52+41.76+31.45+10*(x-11.1))*(x-6.5)/(x+5))>3533.31+58.9+0.785375*(15.08+30.24+24.05+10*(x-11.1))
    30-1.96sqrt(363.19/n<=0.5124
    25/n-0.98/sqrt(n) <= 0.5124
    25/n-0.98/sqrt(n)>=0.5124
    25/n+0.98sqrt(n)>=0.5124
    26700+X-X*10%/12*3 ≥50000

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