1/9200
    x/10000+(1-x)/2000
    1/9200>x/9800+(1-x)/7800
    x/10000+(1-x)/2000<1/9200
    x/9800+(1-x)/7800>1/9200
    x^2-24x+80>0
    -1/4x^2+6x+48<68
    144X2 - 2592<0
    -144X2 + 2592>0
    144X2-288 X2 + 2592>0
    2^k>100000
    x+5x+25x+250x+2500x≤5600
    q^4+4q^3<1-q^2
    －4082750＋3000000－450000＋A－A×10%/4≥300000
    x*x+10*x-20<0
    （n-1）/(n+1)<3
    3X^2+4X+5＜0
    3m^2-5m＞-4
    1-x^2<1
    49-(x+9)7+15x>-3

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