1.1^n>100
    ln ( 5 * x + 3 ) ≥0
    3x+50<1.2x
    3x+50<1.2x
    m²＜16
    （x+1）（2x+1）＞0
    1000*x+(1-x)*201000＞2000*x+(1-x)*x*4000+(1-2*x+x^2)*204000
    1000*x+(1-x)*201000＜2000*x+(1-x)*x*4000+(1-2*x+x^2)*204000
    199000*x＞198000*x+(1-x)*x*196000
    201000*x+(1-x)*1000＞202000*x+(1-x)*x*204000
    x*1000+(1-x)*200000＞2000*x+4000*x*(1-x)+200000*(1+x^2-2*x)
    x*1000+(1-x)*200000＞2000*x+40000*x*(1-x)+20000*(1-2*x)
    -x^2+4x-4<0
    80+log（0.8，x-16）<=68
    2x-9x＞-7
    2x-9＞-7
    x^x＞(2x)100
    1-2a<=1
    （x+1（2x－1）＞0
    -x²＋4x－2<0

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