407-200/500-407=X-9.0/20.9-X
    （x+1）（x+3）<0
    t^2-4>0
    log(2,(7x+1))<100
    (2^100-1)/7
    （x-2）/3-（x+1）/2＜1
    √1.086=
    149.1/0.7
    X <= 2
    12x^2-144<0
    12x^2-144>0
    4x^3-144x<0
    4x^3-144x>0
    x^2-x-6<=0 x^2+2x-8>0
    x^2-x-6<=0 x^2+2x-8
    x^2-4x+3
    (2x+3)(3x－1)＜0
    abs(x+1)-abs(x-2)>=x^3-2x^2-3
    abs(x+1)-abs(x-2)>=2
    9x^2-666x+11025<0

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