5/(x-1)<1/(x+6)
    （6-x-x^2）*（x^2-2x+1）＞0
    n^2+31n-800>0
    n^2+31n-800>200
    104.8<√(2432^2+1520^2)/12.5/x≤104.9
    x^2-x+1>=0
    101.9<√(2400^2+1500^2)/12.5/x<102.1
    101.9<√(2560^2+1600^2)/12.5/x<102.1
    104.3≤√(2560^2+1600^2)/12.5/x≤104.6
    103.0<√(3010^2+1881.25^2)/12.5/x≤103.1
    107.1<√(2560^2+1600^2)/12.5/x≤107.3
    104.8≤√(3010^2+1881.25^2)/12.5/x≤105.0
    99.5≤√(2432^2+1520^2)/12.5/x<100.5
    99.5≤√(2560^2+1660^2)/12.5/x<100.5
    99.5≤√(3010^2+1881.25^2)/12.5/x<100.5
    99.5≤√(3200^2+2000^2)/12.5/x<100.5
    99.5≤（√(3200^2+2000^2))/x<100.5
    99.5≤√(3200^2+2000^2)/x<100.5
    99.5≤100*(301.88739622581132196226113208392/x)<100.5
    99.5≤100(301.88739622581132196226113208392/x)<100.5

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