-363282-1.551*（1300+273.15）+8.314*（1300+273.15）ln[(100/x)-1]=0
    4s^3+0.4s^2+0.01s=1.46*10^-10
    x-0.2(x-800)＝1760
    10X＝15X
    45/sqrt(x+4)/(x+9)/sqrt(x+9)=1
    arctan(x/2)+3*arctan(x/3)=180
    45/sqrt(x^2+4)/(x^2+9)/sqrt(x^2+9)=1
    5x^(2)-6x^(2)-2
    -288739+90.164*（1500+273.15）+8.314*（1500+273.15）ln[(100/x)-1] = 0
    (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

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