(1/2)^x<2
    (1/2)^x>1/2x-3/4
    X-550-1000x6%/12-1500x8%/12-X*6%/12≥50
    2x^2-5x-42≥0
    0<180-2x<180
    2x+4≥0
    -12500+x-（50000+x）*1% ≥5000
    -12500+x-（50000+x）*1%≥5000
    -12500+x-（50000+x）*1%>5000
    a^2-2*a+9>0
    （25＋x）(80000－2000x)≥200
    m^2+8m<8
    546549<554>
    -2x<0
    －4x×x×x－16x×x＋22x＋9≥0
    -2x<0
    -2x<0
    1÷6＜x²-21x+110
    -10≤9/（m+1）≤6
    129n+510＞1100-40

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