(8/7+(1-(1-a)^7)*(136*a+48)/(7+14*a))<448/7-8*(1-a)^7
    (1+(1-(1-a)^8)*(46*a+12)/(2+5*a))<9-8*(1-a)^8
    （x＋13）*（x+5）≥0
    x＋13*x+5≥0
    6900*a*a-4347*a+(461.1-87.45)<0
    x^2+2x+2≤0
    1.38*a*(0.315-0.5*a)+0.3*(0.315-0.05)>461.1
    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

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