（16.7+78.68）/180>（196.7-x）/X
    78.68/180>（196.7-x）/x
    3x-1>1/2x+3
    3x-1<1/2x+3
    3x-1<1/2+3
    3a+5000-5a≤3800
    x-17≥0
    x(x+1)≥0
    x(x+1)≥5
    x≥5
    2.5x≥5
    x^3<0
    (47755*427+49000*X)/48228>=427+X<=20000
    570*x/(935641+x)>x*0.003
    570*x/(935641+x)>0
    570*x/(935641+x)*5-x*0.003 >0.16401
    570*x/(935641+x)*5-x*0.003 >0.16402
    570*x/(935641+x)*5-x*0.003 >0.16405
    1+b-b^2>0
     1+b-b^2>0

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