(25/（0.5a-0.1））+（16/（0.5*0.3-0.01））≤350
    （16/（0.5a-0.06））+（20/（0.5a-0.02））≤350
    (31+x)/(49+x)>0.85
    x+4小于等于8+3x
     ( 35001794+ 4201.876 * x ) / ( x ^ 3 ) <14
     ( 1849000 + 357 * x ) /( 7.833 * x ^ 2) <16
     ( 1849000 + 357 * x ) /7.833 * x ^ 2 <16
    (1849000+357x)7.833x^2<16
    (184900+357x)/7.833x^2<16
    723.56*10^6<13.8*1200*x*(1050-x/2)
    5x
    3(5-2x)>6-4x
    (5-2x)/4>1/2-1/3x
    336.091*10^6<13.8*1200*x*(1050-x/2)
    419.21*10^6<13.8*1200*x*(1050-x/2)
    779.79*10^6<13.8*1200*x*(1050-x/2)
    3x-4>2+5x
    x-3(x-2)>=4 (1+2x)/3>x-1
    2x-1>0 -3x-1>3 3(x-1)+13>5x-2(5-x) 5-(2x+1)<3-6x
    x-1<=(3/4)x-(1/8)

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