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
    x^4-(1-2x)^4=10/0.15
    x^4-(1-x)^4=10/0.15
    0.01ln（3.4/10000x）+x=3.61/1000
    4+xx=（x-5）（x-5）
    （2a-240）/（a-480）+5=（a-240）/480
    （a+240）/（a-480）-5=（a-720）/480
    （a+240）/（a-480）+5=（a-720）/480

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