0.25*(1+m-√(m*m+2m+9))<1
    2x²+3x≥0
    4x^2-1>0
    -2x^2+x+1>0
    6x^2-x-2>0
    -550-(1000×6%/12+1500×8%/12)+x－x×6%/12≥50，
    -550-(1000×6%/12+1500×8%/12)+x－x×6%/12≥50，
    x^2+59x-2400＜0
    1/2＾t-3≥0.5 t>1
    1/2＾t-3≥0.5
    -4x^3+25x^2-20x+4<0
    3x＾2－6x＋6＞0
    399.0591x^2-32000x+640000>=0
    3800+3800x<3800-3800x
    3800+3800x<(1900+799.1x)*2
    (1900-800*(1-x)*2＞(1900*(1+0.1)-800)*2
    30>2f f<15<2f f<7<2f 23>2f
    30>2f f<15<2f
    x<3 ,1/x
    x<3 1/x

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