X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1=1000
    X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1=1000
    X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1=1000
    X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1=1000
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    7.4*sin(x)/cos(x-5)+10*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+10*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+10*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+100*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1000
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1000
    (25-9x^2)^0.5+（25-x^2）^0.5=4x
    （3400*9000+5000*x）/（9000+x）=4000
    x=-lnx
    (0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)))=1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    0.1922^2=2/x-2/x^2*(1-e^(-x))
    2x=-lnx

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