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    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5
    (160^(1-x)-1)/(1-x)=1
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    (160^(1-x)-1)/(1-x)=0.5*(300^(1-x)-1)/(1-x)+0.5/(1-x)
    1-x=x^2
    13 x ^ 2 -7 5 x + 81=0
    10/11+2X=10
    25/12+2X=10
    5/12+2X=10
    5/11+2X=10
    5/16+2X=10
    34*5/21+2X=10
    (x+6)²=2x²
    m^2-50m-475=0
    (15x+35)×1.5=22x+68
    2x减x^2
    m²+4m+3=0
    m²+4m+3=0

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