1.39*（305+a）>1.35*(325+a)
    x/2+1≥x-3
    a*a>a*（20+（a-1）*2/5）
    a+5
    a+5≤sqrt(a^2+6a+1)
    -a-5≤sqrt(a^2+6a+1)
    2.73>0.45√（0.9+V）＋V^(2)
    X^(2)-X+18=0
    X^(2)+8X-1568=0
    2x+1<6
    (15322-X+3661)/12447.36≤[(15322-X)/(15322-X+3661)]*1.4+[3661/(15322-X+3661)]*2
    x*x-2*2x-8x*x<0
    9x^2-6x+1<=0
    9x62-6x+1<=0
    x*x-2x+1>0
    -x*x+2x>3
    9x*x-6x+1<=0
    4（2x-1）>3（x＋2）
    19.6078*（x-153）/x = 2
    9x^2+6x-8>0

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