651.84*（1.67+n）+57.61*(15.5+n)+411.08*(11.5+n)-1.2*3.38*(15.73+n)-1.2*103.25*(12.51+n)-1.2*347.65*(8.19+n)-1.2*613*(2.74+n)≥0
    16.254×n×n+5.526×n×n×n-2098.25464-419.564×n≥0
    13<25x<15
    11<26x<13
    5<10x<7
    9<15x<11
    12<20x<14
    12<14x<14
    11<14x<13
    10<13x<12
    10<11x<12
    5<4x<7
    1920x+69600＞2160x+54000
    1920x+69600＞210x+54000
    (1500*a-1000)/1000>5%
    -1/20000 <1/2 *(-41000+2x)/((21000-x)(20000-x))
    x^2-3000x+1000000<0
    x^4-10x^3+33x^2-40x+10>0
    0.75^n＜0.1
    a+3>2-3a>0

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