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    10%*50=10%*x
     x=50/2
    5%*50=10%*x
    (X+9)/2=6
    (x+9)/2=6
    (x+9)/2=6
    x(920-x)=117482.52
    2330=139800*x/((1+x)^60-1)
    1/2sinx+1/2
    5x+10=12*(1+x)^2
    500/(1+x)+500/(1+x)^2+500/(1+x)^3=1200
    500/(1+x)+500/(1+x)^2=1200
    x^2+x=462
    x^2+5x-414=0
    x^1/2=2-x
    x+㏑x=-1
    x+㏑x=-1
    x^2*lg((0.5*0.023)/(x*17.3))=(1-x)^2*lg((0.5*0.023)/((1-x)*0.33))
    2*x=1
    5.13=【37.1598×1.0188(X+0.1)】÷【1+1.0188×(X+0.1)】×【(100-15.51%-2.93)÷100】×【1÷(1+0.31×2.93)】+【8.33%×(X+0.1)】÷【(1.32×0.101325)】

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