x^2+5x+4＞0 x^2+5x-14＞0
    x^2+4x-32<0
    x^2+5x+4＞0
    x^2+8x<0
    x^2-12<0
    （8-x）/15+11x/75≥1
    a4+4a3+40a2-12a+1<0
    0.7^x<0.2
    (1-0.3)^x<1.8
    xx-10x+9>=0
    (x-1/2)(x-2)<0
    (3x+1)/(2x-1) <2
    (3x+10)/(2x-1)<2
    (x+1)/(x-1)>=0
    x(x+9)>3(x-3)
    xx-3x-18<0
    （800－20n）n＞600n
    （820－20n）n＞600n
    （820－20n）n≥600n
    (46906-x*24.5*7.736)/(6100-x*24.5)*1.06<7.96

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