138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    138.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    ln（1+1/x）
    183.83-45.78sin2x-114.45cos2x-10.55cos4x-8.44sin4x=0
    11%=0.6*(1+g)/[12*(1-6%)]+g
    （1+x）^9
    4/2=8/x
    (x/1+x)= 10^-6
    (x/1+x)-1 = 10^-6
    x+0.02x=19710
    （3X-2）/4=8
    （40000-2400*2）/(210+x)=142
    （40000-2400*3）/(210+x)=142
    （40000-2400*3）/(210+x)=142
    （40000-2400*3）/(210+x)=142
    （40000-2400*2）/(210+x)=142
    （40000-4800）/(210+x)=142
    7600/(150+x) + 27600/(210+x) = 142

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