214304-181.879*（900+273.15）+8.314*（900+273.15）ln[(100/x)-1] = 0
    214304-181.879*（800+273.15）+8.314*（800+273.15）ln[(100/x)-1] = 0
    214304-181.879*（700+273.15）+8.314*（700+273.15）ln[(100/x)-1] = 0
    x/358.2/(x/358.2+1/18)=0.0001404
    20*x-x^(2)-2.3*x^(0.8)+1.15*x^(1.8)=0
    2X^(2)-4x+5
    x/358.2/(x/358.2+100/18)=0.1404
    x/358.2/(x/358.2+100/18)=140.4
    2(X^(2))-4x+5
    x^2-(4/9)*x+4/81=0
    x/358.2/(x/358.2+100/18)=0.0001404
    3X-1.5=15
    15k^2+3.9k+0.46=1
    15k^2+3.9k+0.46=
    180833-152.507*（900+273.15）+8.314*（900+273.15）ln[(100/x)-1]
    X+X*0.13=1799
    （a-25）×0.000019=0.015
    sin（3.14*x）+sin(3.93-6.28*x)+9.53*sin（3.14*x）*sin（3.14*x）*sin（3.14*x）=38795.91
    1+x=3
    6cosx-6xsinx

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