(1+r/100)^4=1.2
    s^3+3*s^2+3*s-2=0
    2(x^(2))-4x-3
    2X^(2)-4x-3
    -288739+90.164*（700+273.15）+8.314*（700+273.15）ln[(100/x)-1] = 0
    x+7.835*x^(1/5)-20=0
    -288739+90.164*（1300+273.15）+8.314*（1300+273.15）ln[(100/x)-1] = 0
    X^(2)+11x+30
    2^(2x+6)*5^(x+3)=100^(x+1)
    X^(2)-2x-15
    214304-181.879*（1300+273.15）+8.314*（1300+273.15）ln[(100/x)-1] = 0
    214304-181.879*（1200+273.15）+8.314*（1200+273.15）ln[(100/x)-1] = 0
    214304-181.879*（1100+273.15）+8.314*（1100+273.15）ln[(100/x)-1] = 0
    214304-181.879*（1000+273.15）+8.314*（1000+273.15）ln[(100/x)-1] = 0
    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

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