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
    (46906-x*24.5*8.2)/(6100-x*24.5)*1.06<7.96
    x2-5x+6>0
    1/(x+2)<3
    (2x+1)/(x-3) <1
    (2x+10)/(x-3)<1
    （x+2）/(x-1)>0
    x*e^(0.1657*x)<=7.5438

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