-4082750+3000000+X-X*0.1/4-450000≥300000
    550a+(700-55a) /45*495<7370
    234=124
     (2x+3)/(x-3) >(6x-5)/(3x+1)
    (2x+3)/(x-3)>(6x-5)(3x+1)
    x-188+x-219=311
    2.226=X-9.0/20.9-X
     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

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