（0.1627-x)/sqrt(x*(1-x))>=1.645/sqrt(200000)
    （0.1627-x)/sqrt(x*(1-x))>=1.645/sqrt(10000)
    （0.1627-x)/sqrt(x*(1-x))>=0.01645
    x≤6x+5
    1+x<4
    sqrt(x-27) -2x+3<0
    sqrt(x-27) -2x+3<0>
    -1/（x+2）≥x
    （x+1）^2（x+4）/（x-1）≥0
    -16300＋a-a×10％/4≥3000
    2≤
    24k-25k∧3>0
    84.2a+46.6(20-a)≥1400
    84.2a+46.6(20-a)≤1550
    6≤5-3x<12
    90x-x*x>1875
    X^2-3x+4≥0
    x^(2)-3x-4>0
    70436800x-21280x^(2)＝2261.241
    18a+26（6—a）≥154

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