10+(1+0.15*(x/2000))^4=20+(1+0.15*((2000-x)/2000))^4
    10+(1+0.15*(x/2000)^4)=20+(1+0.15*((2000-x)/2000)^4)
    10+(1+0.15*(x/2000)^4)=20+(1+0.15*((2000-x)2000)^4)
    10+(1+0.15*(x/2000))^4=20+(1+0.15*((2000-x)2000))^4
    10+(1+0.15*(x/2000))^2=20+(1+0.15*((2000-x)2000))^2
    （X-68017.69）/（X/0.13）=0.004
    10+(1+0.15*(x/2000))^2=20+(1+0.15*((1000-x)2000))^2
    10+(1+0.15*(x/2000))^4=20+(1+0.15*((1000-x)2000))^4
    10+(1+0.15*(x/2000))^6=20+(1+0.15*((1000-x)2000))^6
    10+(1+0.15*(x/2000))^6=20+(1+0.15*((1000-x)/1000))^6
    10+(1+0.15*(x/2000))^1=20+(1+0.15*((1000-x)/1000))^1
    10+(1+0.15*(x/2000))^2=20+(1+0.15*((1000-x)/1000))^2
    10+(1+0.15*(x/2000))^3=20+(1+0.15*((1000-x)/1000))^3
    10+(1+0.15*(x/2000))^4=20+(1+0.15*((1000-x)/1000))^4
    (x/2000)^3-(1-x/1000)^3=10/0.15
    x^3-(1-x)^3=10/0.15
    x^2-(1-x)^2=10/0.15
    x^2-(1-2x)^2=10/0.15
    x^2-(1-2x)^2=10/015
    x^4-(1-2x)^4=66

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