x（x+20）=160
    16*sqrt((0.47w)^2+1)=w*sqrt(1+w^2)*sqrt((0.034w)^2+1)
    16sqrt((0.47w)^2+1)=w*sqrt(1+w^2)*sqrt((0.34w)^2+1)
    arc(cos0.8)
    arc0.8
    6×x/5＋5×sqrt(4-x^2)/8=0
    2/3*((1-1/0.06)+(3/4+1/0.06)*(1/3*205.68/x*0.35805183739485175)^0.06)=5.432352941/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*155.6/x*0.35805183739485175)^0.07)=4.801960784/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*155.6/x*0.35805183739485175)^0.07)=4.380392157/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*150.34/x*0.35805183739485175)^0.07)=4.380392157/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*155.6/x*0.35805183739485175)^0.07)=4.86372549/x
    (0.1x+5)/0.03=5
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*162.79/x*0.35805183739485175)^0.07)=5.17254902/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*167.39/x*0.35805183739485175)^0.07)=5.567647059/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*171.99/x*0.35805183739485175)^0.07)=5.644117647/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*176.58/x*0.35805183739485175)^0.07)=5.67745098/x
    2x+5=6
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*178.88/x*0.35805183739485175)^0.07)=5.782352941/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*181.18/x*0.35805183739485175)^0.07)=5.853921569/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*183.25/x*0.35805183739485175)^0.07)=6.412745098/x

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