503043-272.043*（800+273.15）+8.314*（800+273.15）ln[(100/x)-1] = 0
    503043-272.043*（700+273.15）+8.314*（700+273.15）ln[(100/x)-1] = 0
    3x+1>5(x-1)
    503043-272.043*（2000+273.15）+8.314*（2000+273.15）ln[(100/x)-1] = 0
    3x-1≤0
    (X-1)/2小于等于(2X-1)/3
    9x^-7x-22=0
    3(x+1)>5x+4
    3x+2小于4x
    X -5大于1+ 2X
    2x
    3x-1>4
    4/1-x=120
    1/(1-((0.8*0.019)/(1.2*(0.015-x)))=15.38
    (1-5x)^2=16(1-x^2)
    ln(1-x)=1
    log(x)=0.459
    2x^2-7x≤x^2-12
    2x=60
    (X+3)(x-1)>-3

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