sqrt（（7.5/2）^2+（6.85/2）^2）=x
    sqrt（（7.47/2）^2+（5.5/2）^2）=x
    sqrt（（6.3/2）^2+（5.32/2）^2）=x
    sqrt（（7.6/2）^2+（5.7/2）^2）=x
    sqrt（（10.1/2）^2+（5.35/2）^2）=x
    sqrt（（10.1/2）^2+（5.35/2）^7）=x
    122x^2+125x-625=0
    3/a+1-a+1
    -3x-3=3/2x-6
    -3x-3=3/2-6x-6
    -3x-3=3/2-6
    x/9619.6794+400x/(1.05*1430*1000*(1-0.8*x/(1.65*10^7)))=310
    atctan（（2×π×200×0.1-1/2×π×200×0.5×0.0000001）/200）
    (x-1)=x/28
    x/(x+2)=0.0944
    x/(x+2)=0.0871
    x/(x+2)=0.0796
    x/(x+2)=0.0721
    x/(x+2)=0.0644
    x/(x+2)=0.0567

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