3/x+2＞x
    (n-2)/2+n-3≤3
    (2-n)/2+n-3≤3
    abs(2-n)/2+abs(3-n)≤3
    (3*(abs(2-n)+abs(3-n)))/2-(2*abs(2-n))/2-abs(3-n)/2≤3
    (4*(abs(2-n)+abs(3-n)))/2-(2*abs(2-n))/2-abs(3-n)/2≤3
    3*abs(2-n)+1.5*abs(3-n)≤3
    abs(2-n)+1.5*abs(3-n)≤3
    abs(2-n)+1.5*(3-n)≤3
    (x+3)/5>2x+3 (x+3)/5>1-x
    -3(x-2)>=4-x
    -2679.184+886.09n+n^2/3×(740.431+19.119n)×(2221.293+38.238n)/(1480.862+38.238)-0.4×n^2×(251.107+4.766n)×(753.321+9.531n)/(502.214+9.531n)≥0
    3*（x-1）+1>5x-2(1-x)
    (4*X-1.5)/0.5-(5*x-0.8)/0.2<(1.2-x)/0.1
    -1000+(1000)/(1+x)+(200)/(1+x)^2+(200)/(1+x)^3+(200)/(1+x)^4>0
    -1000+(100)/(1+x)+(350)/(1+x)^2+(600)/(1+x)^3+(850)/(1+x)^4>0
    (-1000)/(1+x)+(1000)/(1+x)^2+(200)/(1+x)^3+(200)/(1+x)^4+(200)/(1+x)^5>0
    (-1000)/(1+x)+(100)/(1+x)^2+(350)/(1+x)^3+(600)/(1+x)^4+(850)/(1+x)^5>0
    (100)/(1+x)+(350)/(1+x)^2+(600)/(1+x)^3+(850)/(1+x)^4>0
    (100-1000)/(1+x)+(350-1000)/(1+x)^2+(600-1000)/(1+x)^3+(850-1000)/(1+x)^4>0

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