x^4=9
    x^4=3
    √x^4=3
    （√x）^4=3
    （√x）^4=1
    4xx-8x=0
    m+3-2m+m-2
    x=3.703+0.286*11.8189+9.164*10^(-3)*11.8189^2+1.446*10^(-4)*11.8189^3+1.741*10^(-6)*11.8189^4+5.195*10^(-8)*11.8189^5
    [1.8515+0.286*x+9.164*10^(-3)*x^2+1.446*10^(-4)*x^3+1.741*10^(-6)*x^4+5.195*10^(-8)*x^5]/x=0.286+2*9.164*10^(-3)*x+3*1.446*10^(-4)*x^2+4.1.741*10^(-6)*x^3+5*5.195*10^(-8)*x^4
    m+3-2m+m-2
    m+3-2m+m-2
    m+3-2m+m-2=1
    m+3-2m+m-2
    xx-3x-4=0
    1-1/x*x
    x=3.703+0.286*0.602475+9.164*10^(-3)*0.602475^2+1.446*10^(-4)*0.602475^3+1.741*10^(-6)*0.602475^4+5.195*10^(-8)*0.602475^5
    x/[1.8515+0.286*x+9.164*10^(-3)*x^2+1.446*10^(-4)*x^3+1.741*10^(-6)*x^4+5.195*10^(-8)*x^5]=0.286+2*9.164*10^(-3)*x+3*1.446*10^(-4)*x^2+4.1.741*10^(-6)*x^3+5*5.195*10^(-8)*x^4
    x/[1.8515+0.286*x+9.164*10^(-3)*x^2+1.446*10^(-4)*x^3+1.741*10^(-6)*x^4+5.195*10^(-8)*x^5]=0.286+2*9.164*10^(-3)*x
    x/[1.8515+0.286*x+9.164*10^(-3)*x^2+1.446*10^(-4)*x^3+1.741*10^(-6)*x^4+5.195*10^(-8)*x^5]=0.286+2*9.164
    （80-x-50）（20+3x/2）=616

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