Mathematics
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    267000+X-X×10%÷36≥50000
    x^2-3*x<2*(x-3)
    -x^2+7<5-x
    3x/(x+1)<1
    -2^x<1
    3x+7>1
    -2+0.25+a>0 1+2+a<0
    (32m)^2-4(4m+1)(64m-4)>0
    x+2>1
    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

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