-1/x^5=0
    -1/x^(2)
    2.7=10^(11.76-2x)+10^(2.76-x)+10^(50.86-3x)+10^(67.36-5x)+10^(90.56-6x)+10^(41.52-5x)
    [(700*12*0.9)-(70%*130X*6.4%)]/[(30%*130X)+(5%*130X)]=3.8%
    (40-x)15
    (700*12*0.9-70%*130X*6.4%)/(30%*130X+5%*130X)=3.8%
    x^3-140*x^2+600*x+192000=0
    441x-80x^3=0
    2x减3.2等于5.4
    -(1-x)*(1-x)*lnX=0.5
    1-lnx/x^(2)
    800.988+147.70125x=9.9572*(6.1045+x)+156.6425*(1.167+x)+0.5*(110.43*(x/3.5))*x*x/3+106.8x*x
    5(x-7/10)=6.5
    5x加上4.5等于10
    6x=0
    X=420((30/7-X)/2.1-1)^2
    x^3-3x+2=0
    2x^2-x-2=0
    3x^(2)-3=0
    2x^2-x-1=0

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